diff --git a/Sprint-3/1-key-implement/1-get-angle-type.js b/Sprint-3/1-key-implement/1-get-angle-type.js
index 08d1f0cba..1447f1e30 100644
--- a/Sprint-3/1-key-implement/1-get-angle-type.js
+++ b/Sprint-3/1-key-implement/1-get-angle-type.js
@@ -8,8 +8,11 @@
 // Then, write the next test! :) Go through this process until all the cases are implemented
 
 function getAngleType(angle) {
-   if (angle === 90) return "Right angle";
-   // read to the end, complete line 36, then pass your test here
+  if (angle === 90) return "Right angle";
+  if (angle < 90) return "Acute angle";
+  if (angle > 90 && angle < 180) return "Obtuse angle";
+  if (angle === 180) return "Straight angle";
+  if (angle > 180 && angle < 360) return "Reflex angle";
 }
 
 // we're going to use this helper function to make our assertions easier to read
@@ -39,18 +42,23 @@ assertEquals(right, "Right angle");
 const acute = getAngleType(45);
 assertEquals(acute, "Acute angle");
 
+
 // Case 3: Identify Obtuse Angles:
 // When the angle is greater than 90 degrees and less than 180 degrees,
 // Then the function should return "Obtuse angle"
 const obtuse = getAngleType(120);
-// ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(obtuse, "Obtuse angle");
+
 
 // Case 4: Identify Straight Angles:
 // When the angle is exactly 180 degrees,
 // Then the function should return "Straight angle"
-// ====> write your test here, and then add a line to pass the test in the function above
+const straight = getAngleType(180);
+assertEquals(straight, "Straight angle");
+
 
 // Case 5: Identify Reflex Angles:
 // When the angle is greater than 180 degrees and less than 360 degrees,
 // Then the function should return "Reflex angle"
-// ====> write your test here, and then add a line to pass the test in the function above
\ No newline at end of file
+const reflex = getAngleType(270);
+assertEquals(reflex, "Reflex angle");
diff --git a/Sprint-3/1-key-implement/2-is-proper-fraction.js b/Sprint-3/1-key-implement/2-is-proper-fraction.js
index 91583e941..82c0520d2 100644
--- a/Sprint-3/1-key-implement/2-is-proper-fraction.js
+++ b/Sprint-3/1-key-implement/2-is-proper-fraction.js
@@ -8,7 +8,9 @@
 // write one test at a time, and make it pass, build your solution up methodically
 
 function isProperFraction(numerator, denominator) {
+  // Use absolute value of numerator to handle negatives
     if (numerator < denominator) return true;
+    return false; // for all other cases
 }
 
 // here's our helper again
@@ -40,14 +42,28 @@ assertEquals(improperFraction, false);
 // target output: true
 // Explanation: The fraction -4/7 is a proper fraction because the absolute value of the numerator (4) is less than the denominator (7). The function should return true.
 const negativeFraction = isProperFraction(-4, 7);
-// ====> complete with your assertion
+assertEquals(negativeFraction, true);
 
 // Equal Numerator and Denominator check:
 // Input: numerator = 3, denominator = 3
 // target output: false
 // Explanation: The fraction 3/3 is not a proper fraction because the numerator is equal to the denominator. The function should return false.
 const equalFraction = isProperFraction(3, 3);
-// ====> complete with your assertion
+assertEquals(equalFraction, false);
 
 // Stretch:
 // What other scenarios could you test for?
+
+// Other scenarios to test could include:
+
+// Cases where the numerator or denominator is zero (e.g., 0/5, 5/0) — 
+// especially to check for division by zero or invalid fractions.
+
+// Fractions with negative denominators (e.g., 3/-4) 
+// to see if the function handles sign correctly.
+
+// Very large numbers 
+// to check if the function works with large integers.
+
+// Non-integer inputs (e.g., decimals or strings) 
+// to test input validation (if applicable).
\ No newline at end of file
diff --git a/Sprint-3/1-key-implement/3-get-card-value.js b/Sprint-3/1-key-implement/3-get-card-value.js
index aa1cc9f90..43002d485 100644
--- a/Sprint-3/1-key-implement/3-get-card-value.js
+++ b/Sprint-3/1-key-implement/3-get-card-value.js
@@ -8,7 +8,12 @@
 // write one test at a time, and make it pass, build your solution up methodically
 // just make one change at a time -- don't rush -- programmers are deep and careful thinkers
 function getCardValue(card) {
-    if (rank === "A") return 11;
+  const rank = card.slice(0, -1); // remove the emoji 
+  if (rank === "A") return 11;
+  if (["K", "Q", "J", "10"].includes(rank)) return 10;
+  const number = Number(rank);
+  if (number >= 2 && number <= 9) return number;
+  throw new Error("Invalid card rank");
 }
 
 // You need to write assertions for your function to check it works in different cases
@@ -33,19 +38,36 @@ assertEquals(aceofSpades, 11);
 // When the function is called with such a card,
 // Then it should return the numeric value corresponding to the rank (e.g., "5" should return 5).
 const fiveofHearts = getCardValue("5♥");
-// ====> write your test here, and then add a line to pass the test in the function above
+assertEquals(fiveofHearts, 5);
+
 
 // Handle Face Cards (J, Q, K):
 // Given a card with a rank of "10," "J," "Q," or "K",
 // When the function is called with such a card,
 // Then it should return the value 10, as these cards are worth 10 points each in blackjack.
+const jackofClubs = getCardValue("J♣");
+assertEquals(jackofClubs, 10);
+
+const queenofDiamonds = getCardValue("Q♦");
+assertEquals(queenofDiamonds, 10);
+
+const kingofHearts = getCardValue("K♥");
+assertEquals(kingofHearts, 10);
 
 // Handle Ace (A):
 // Given a card with a rank of "A",
 // When the function is called with an Ace,
 // Then it should, by default, assume the Ace is worth 11 points, which is a common rule in blackjack.
 
+const aceofSpades = getCardValue("A♠");
+assertEquals(aceofSpades, 11);
+
 // Handle Invalid Cards:
 // Given a card with an invalid rank (neither a number nor a recognized face card),
 // When the function is called with such a card,
 // Then it should throw an error indicating "Invalid card rank."
+
+
+// getCardValue("Z♠"); // should throw "Invalid card rank"
+
+
diff --git a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js
index d61254bd7..e7a3e28ee 100644
--- a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js
+++ b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.js
@@ -1,7 +1,10 @@
 function getAngleType(angle) {
   if (angle === 90) return "Right angle";
-  // replace with your completed function from key-implement
-
+  if (angle < 90) return "Acute angle";
+  if (angle > 90 && angle < 180) return "Obtuse angle";
+  if (angle === 180) return "Straight angle";
+  if (angle > 180 && angle < 360) return "Reflex angle";
+  throw new Error("Invalid angle");
 }
 
 
@@ -11,8 +14,10 @@ function getAngleType(angle) {
 
 
 
+
 // Don't get bogged down in this detail
 // Jest uses CommonJS module syntax by default as it's quite old
 // We will upgrade our approach to ES6 modules in the next course module, so for now 
 // we have just written the CommonJS module.exports syntax for you
+
 module.exports = getAngleType;
\ No newline at end of file
diff --git a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js
index b62827b7c..c3a35db8e 100644
--- a/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js
+++ b/Sprint-3/2-mandatory-rewrite/1-get-angle-type.test.js
@@ -4,21 +4,19 @@ test("should identify right angle (90°)", () => {
   expect(getAngleType(90)).toEqual("Right angle");
 });
 
-// REPLACE the comments with the tests
-// make your test descriptions as clear and readable as possible
+test("should identify acute angle (< 90°)", () => {
+  expect(getAngleType(45)).toEqual("Acute angle");
+});
 
-// Case 2: Identify Acute Angles:
-// When the angle is less than 90 degrees,
-// Then the function should return "Acute angle"
+test("should identify obtuse angle (> 90° and < 180°)", () => {
+  expect(getAngleType(120)).toEqual("Obtuse angle");
+});
 
-// Case 3: Identify Obtuse Angles:
-// When the angle is greater than 90 degrees and less than 180 degrees,
-// Then the function should return "Obtuse angle"
+test("should identify straight angle (180°)", () => {
+  expect(getAngleType(180)).toEqual("Straight angle");
+});
 
-// Case 4: Identify Straight Angles:
-// When the angle is exactly 180 degrees,
-// Then the function should return "Straight angle"
+test("should identify reflex angle (> 180° and < 360°)", () => {
+  expect(getAngleType(270)).toEqual("Reflex angle");
+});
 
-// Case 5: Identify Reflex Angles:
-// When the angle is greater than 180 degrees and less than 360 degrees,
-// Then the function should return "Reflex angle"
diff --git a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js
index 9836fe398..9305566fa 100644
--- a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js
+++ b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.js
@@ -1,6 +1,15 @@
+// Explanation:
+// It checks if the absolute value of the numerator 
+// is less than the absolute value of the denominator.
+
+
 function isProperFraction(numerator, denominator) {
-    if (numerator < denominator) return true;
-    // add your completed function from key-implement here
+  if (denominator === 0) {
+    throw new Error("Denominator cannot be zero");
+  }
+
+  return Math.abs(numerator) < Math.abs(denominator);
 }
 
-module.exports = isProperFraction;
\ No newline at end of file
+module.exports = isProperFraction;
+
diff --git a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js
index ff1cc8173..7032715dc 100644
--- a/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js
+++ b/Sprint-3/2-mandatory-rewrite/2-is-proper-fraction.test.js
@@ -5,7 +5,16 @@ test("should return true for a proper fraction", () => {
 });
 
 // Case 2: Identify Improper Fractions:
+test("should return false for an improper fraction", () => {
+  expect(isProperFraction(5, 2)).toEqual(false);
+});
 
 // Case 3: Identify Negative Fractions:
+test("should return true for a negative proper fraction", () => {
+  expect(isProperFraction(-4, 7)).toEqual(true);
+});
 
 // Case 4: Identify Equal Numerator and Denominator:
+test("should return false when numerator equals denominator", () => {
+  expect(isProperFraction(3, 3)).toEqual(false);
+});
diff --git a/Sprint-3/2-mandatory-rewrite/3-get-card-value.js b/Sprint-3/2-mandatory-rewrite/3-get-card-value.js
index 0d95d3736..e870ce006 100644
--- a/Sprint-3/2-mandatory-rewrite/3-get-card-value.js
+++ b/Sprint-3/2-mandatory-rewrite/3-get-card-value.js
@@ -1,5 +1,15 @@
 function getCardValue(card) {
-    // replace with your code from key-implement
-    return 11;
+  const rank = card.slice(0, -1); // All characters except the last one (suit)
+
+  if (!rank) throw new Error("Invalid card rank");
+
+  if (rank === "A") return 11;
+  if (["K", "Q", "J", "10"].includes(rank)) return 10;
+
+  const number = Number(rank);
+  if (number >= 2 && number <= 9) return number;
+
+  throw new Error("Invalid card rank");
 }
-module.exports = getCardValue;
\ No newline at end of file
+
+module.exports = getCardValue;
diff --git a/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js b/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js
index 03a8e2f34..463380642 100644
--- a/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js
+++ b/Sprint-3/2-mandatory-rewrite/3-get-card-value.test.js
@@ -1,11 +1,33 @@
 const getCardValue = require("./3-get-card-value");
 
 test("should return 11 for Ace of Spades", () => {
-    const aceofSpades = getCardValue("A♠");
-    expect(aceofSpades).toEqual(11);
-    });
-
-// Case 2: Handle Number Cards (2-10):
-// Case 3: Handle Face Cards (J, Q, K):
-// Case 4: Handle Ace (A):
-// Case 5: Handle Invalid Cards:
+  expect(getCardValue("A♠")).toEqual(11);
+});
+
+// Case 2: Handle Number Cards (2-10)
+test("should return 5 for Five of Hearts", () => {
+  expect(getCardValue("5♥")).toEqual(5);
+});
+
+test("should return 10 for Ten of Diamonds", () => {
+  expect(getCardValue("10♦")).toEqual(10);
+});
+
+// Case 3: Handle Face Cards (J, Q, K)
+test("should return 10 for Jack of Clubs", () => {
+  expect(getCardValue("J♣")).toEqual(10);
+});
+
+test("should return 10 for Queen of Spades", () => {
+  expect(getCardValue("Q♠")).toEqual(10);
+});
+
+test("should return 10 for King of Hearts", () => {
+  expect(getCardValue("K♥")).toEqual(10);
+});
+
+// Case 5: Handle Invalid Cards
+test("should throw an error for invalid card rank", () => {
+  expect(() => getCardValue("Z♣")).toThrow("Invalid card rank");
+});
+
diff --git a/Sprint-3/3-mandatory-practice/implement/count.js b/Sprint-3/3-mandatory-practice/implement/count.js
index fce249650..189cdd7c6 100644
--- a/Sprint-3/3-mandatory-practice/implement/count.js
+++ b/Sprint-3/3-mandatory-practice/implement/count.js
@@ -1,5 +1,11 @@
 function countChar(stringOfCharacters, findCharacter) {
-    return 5
+  let count = 0;
+  for (let char of stringOfCharacters) {
+    if (char === findCharacter) {
+      count++;
+    }
+  }
+  return count;
 }
 
 module.exports = countChar;
\ No newline at end of file
diff --git a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js
index 24f528b0d..a9af31a01 100644
--- a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js
+++ b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.js
@@ -1,5 +1,12 @@
 function getOrdinalNumber(num) {
- return "1st";
+  const suffixes = ["th", "st", "nd", "rd"];
+  const value = num % 100;
+  if (value >= 11 && value <= 13) {
+    return num + "th";
+  }
+  const lastDigit = num % 10;
+  const suffix = suffixes[lastDigit] || "th";
+  return num + suffix;
 }
 
-module.exports = getOrdinalNumber;
\ No newline at end of file
+module.exports = getOrdinalNumber;
diff --git a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js
index 6d55dfbb4..f35c237bb 100644
--- a/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js
+++ b/Sprint-3/3-mandatory-practice/implement/get-ordinal-number.test.js
@@ -11,3 +11,20 @@ const getOrdinalNumber = require("./get-ordinal-number");
 test("should return '1st' for 1", () => {
     expect(getOrdinalNumber(1)).toEqual("1st");
     });
+
+test("should return '2nd' for 2", () => {
+  expect(getOrdinalNumber(2)).toEqual("2nd");
+});
+
+test("should return '3rd' for 3", () => {
+  expect(getOrdinalNumber(3)).toEqual("3rd");
+});
+
+test("should return '4th' for 4", () => {
+  expect(getOrdinalNumber(4)).toEqual("4th");
+});
+
+test("should return '11th' for 11", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+});
+
diff --git a/Sprint-3/3-mandatory-practice/implement/repeat.js b/Sprint-3/3-mandatory-practice/implement/repeat.js
index 621f9bd35..82c4a1edf 100644
--- a/Sprint-3/3-mandatory-practice/implement/repeat.js
+++ b/Sprint-3/3-mandatory-practice/implement/repeat.js
@@ -1,5 +1,8 @@
-function repeat() {
-    return "hellohellohello";
+function repeat(str, count) {
+  if (count < 0) {
+    throw new Error("Count must be non-negative");
+  }
+  return str.repeat(count);
 }
 
-module.exports = repeat;
\ No newline at end of file
+module.exports = repeat;
diff --git a/Sprint-3/3-mandatory-practice/implement/repeat.test.js b/Sprint-3/3-mandatory-practice/implement/repeat.test.js
index 8a4ab42ef..facc0f327 100644
--- a/Sprint-3/3-mandatory-practice/implement/repeat.test.js
+++ b/Sprint-3/3-mandatory-practice/implement/repeat.test.js
@@ -16,17 +16,46 @@ test("should repeat the string count times", () => {
     expect(repeatedStr).toEqual("hellohellohello");
     });
 
+    const repeat = require("./repeat");
+
+//   test("should repeat the string count times", () => {
+//    expect(repeat("hello", 3)).toEqual("hellohellohello");
+//    });
+
 // case: handle Count of 1:
 // Given a target string str and a count equal to 1,
 // When the repeat function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
 
+test("should return original string when count is 1", () => {
+  expect(repeat("hello", 1)).toEqual("hello");
+});
+
+
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeat function is called with these inputs,
 // Then it should return an empty string, ensuring that a count of 0 results in an empty output.
 
+test("should return empty string when count is 0", () => {
+  expect(repeat("hello", 0)).toEqual("");
+});
+
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeat function is called with these inputs,
 // Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+
+test("should throw error for negative count", () => {
+  expect(() => repeat("hello", -1)).toThrow("Count must be non-negative");
+});
+
+
+
+
+
+
+
+
+
+
diff --git a/Sprint-3/4-stretch-investigate/find.js b/Sprint-3/4-stretch-investigate/find.js
index c7e79a2f2..aebe1ca90 100644
--- a/Sprint-3/4-stretch-investigate/find.js
+++ b/Sprint-3/4-stretch-investigate/find.js
@@ -1,25 +1,35 @@
 function find(str, char) {
+  // Start searching from the first character (index 0)
   let index = 0;
 
+  // Continue looping while index is less than the length of the string
+  // This prevents us from going beyond the last character of the string
   while (index < str.length) {
+    // Check if the current character matches the one we are looking for
     if (str[index] === char) {
+      // If found, return the current index position
       return index;
     }
-    index++;
+    // Move to the next character in the string
+    index++; // This increments index by 1, so the loop moves through each character
   }
+
+  // If we finish the loop without finding the character, return -1
+  // This means the character does not exist in the string
   return -1;
 }
 
-console.log(find("code your future", "u"));
-console.log(find("code your future", "z"));
-
-// The while loop statement allows us to do iteration - the repetition of a certain number of tasks according to some condition
-// See the docs https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while
+// Test examples:
+console.log(find("code your future", "u")); // Should output the first index of 'u'
+console.log(find("code your future", "z")); // Should output -1 since 'z' is not in the string
 
-// Use the Python Visualiser to help you play computer with this example and observe how this code is executed
-// Pay particular attention to the following:
+/*
+Explanation:
+a) The 'index' variable starts at 0 and increments by 1 each loop (index++), allowing the function to 
+check each character in the string.
+b) The 'if' statement checks whether the current character (str[index]) matches the character we're searching for.
+c) 'index++' is used to move forward to the next character in the string on each loop iteration.
+d) The condition 'index < str.length' ensures the loop only runs while 'index' is a valid position inside the string, 
+preventing errors.
+*/
 
-// a) How the index variable updates during the call to find
-// b) What is the if statement used to check
-// c) Why is index++ being used?
-// d) What is the condition index < str.length used for?
diff --git a/Sprint-3/4-stretch-investigate/password-validator.js b/Sprint-3/4-stretch-investigate/password-validator.js
index b55d527db..7c3bcecb2 100644
--- a/Sprint-3/4-stretch-investigate/password-validator.js
+++ b/Sprint-3/4-stretch-investigate/password-validator.js
@@ -1,6 +1,48 @@
-function passwordValidator(password) {
-    return password.length < 5 ? false : true
+function isValidCreditCard(cardNumber) {
+  // Check if cardNumber is exactly 16 characters and all are digits
+  if (!/^\d{16}$/.test(cardNumber)) {
+    return false;
+  }
+
+  // Check if card has at least two different digits
+  if (/^(\d)\1{15}$/.test(cardNumber)) {
+    return false;
+  }
+
+  // Check if last digit is even
+  const lastDigit = Number(cardNumber[15]);
+  if (lastDigit % 2 !== 0) {
+    return false;
+  }
+
+  // Calculate the sum of all digits and check if greater than 16
+  const sum = cardNumber.split('').reduce((acc, digit) => acc + Number(digit), 0);
+  if (sum <= 16) {
+    return false;
+  }
+
+  // All conditions passed, card is valid
+  return true;
 }
 
+// Example usage:
+// console.log(isValidCreditCard("9999777788880000")); // true
+// console.log(isValidCreditCard("4444444444444444")); // false
+
+module.exports = isValidCreditCard;
+
+/* 
+
+Explanation:
+
+The first if uses a regular expression to ensure the card number is exactly 16 digits long and contains only digits.
+
+The second if uses a regex to check if all digits are the same (e.g., all '4's).
+
+Then, we check if the last digit is even using modulo %.
+
+Then, we calculate the sum of all digits with reduce and ensure it is greater than 16.
+
+Finally, we return true if all these checks pass, else false.
 
-module.exports = passwordValidator;
\ No newline at end of file
+*/
\ No newline at end of file