diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a07..5d5920941a 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -11,3 +11,7 @@ function capitalise(str) {
 
 // =============> write your explanation here
 // =============> write your new code here
+// [ChunYanWong]The uncaught type error will occur if the string is empty
+// if (str.length > 0) {
+//    let str = ...
+// 
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f4..5efefa5a6a 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -15,6 +15,10 @@ function convertToPercentage(decimalNumber) {
 console.log(decimalNumber);
 
 // =============> write your explanation here
+// [ChunYanWong] decimalNumber is undefined in the main function so error will occur
+
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+// [ChunYanWong] Add const decimalNumber = 0.5 in the main function 
+
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cfe..d98afa733a 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -11,10 +11,17 @@ function square(3) {
 
 // =============> write the error message here
 
+// [ChunYanWong] Uncaught SyntaxError SyntaxError: Unexpected number
+
 // =============> explain this error message here
 
+// [ChunYanWong] number 3 cannot be parameter
+
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+// [ChunYanWong] function square(num) {
+// ...
+
 
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b417..8337b81f96 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -8,7 +8,15 @@ function multiply(a, b) {
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
+// [ChunYanWong] 
+//320
+//The result of multiplying 10 and 32 is undefined
+
 // =============> write your explanation here
+// [ChunYanWong] The program can be executed but no return statement in the function and hence no value is returned.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+// [ChunYanWong]
+// console.log(a * b);
+// return (a * b)
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcfd..9f36e78fdf 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -8,6 +8,12 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
+// [ChunYanWong] 
+// The sum of 10 and 32 is undefined
+
 // =============> write your explanation here
+// [ChunYanWong] a+b should be included in the return statement
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+// [ChunYanWong] return (a+b);
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc35..82f913a959 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -13,12 +13,30 @@ console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
+// [ChunYanWong] No parameter included in the function and hence the same output
+
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+
+// [ChunYanWong] 
+//The last digit of 42 is 3
+//The last digit of 105 is 3
+//The last digit of 806 is 3
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+
+// [ChunYanWong] No parameter included in the function
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+// [ChunYanWong] function getLastDigit(num) {
+//  ...
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// [ChunYanWong] for the case 12.34, it will return 4 instead of the digit 2
+// [ChunYanWong] function getLastDigit(num) {
+//       return Math.abs(Math.trunc(num)) % 10;
+//     }
+
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1b..c429883016 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -16,4 +16,5 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+    return Math.round((weight/(height*height)*10))/10;
+}
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad9..f47951c3e1 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,7 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+function toUpperCase(words) {
+  return words.toUpperCase();
+}
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a703..cf69c11af3 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,23 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+function toPounds(penceString)
+{
+  const penceStringWithoutTrailingP = penceString.substring(
+    0,
+    penceString.length - 1
+  );
+
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  const pounds = paddedPenceNumberString.substring(
+    0,
+    paddedPenceNumberString.length - 2
+  );
+
+ const pence = paddedPenceNumberString
+  .substring(paddedPenceNumberString.length - 2)
+  .padEnd(2, "0");
+
+ return(`£${pounds}.${pence}`);
+
+}
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 17127bc01e..0874721587 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -22,17 +22,21 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// [ChunYanWong] 3
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
-
 // b) What is the value assigned to num when pad is called for the first time?
 // =============> write your answer here
+// [ChunYanWong] 0
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
+// [ChunYanWong] 00
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// [ChunYanWong] pad(remainingSeconds) where remainingSeconds = 1
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// [ChunYanWong] 01
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b8..738ae5c1e4 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -23,3 +23,30 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+// [ChunYanWong] Find the bugs as follows
+// Midnight Bug (00:xx): For "00:15", it returns "00:15 am" instead of "12:15 am".
+// Noon Bug (12:xx): For "12:35", it hits the else block and returns "12:35 am" instead of "12:35 pm".
+// Minutes are Hardcoded: For "16:45", it discards the actual minutes and hardcodes :00 pm, returning "3:00 pm".
+
+//function formatAs12HourClock(time) {
+  // Guard clause: handle invalid or empty inputs safely
+//  if (!time || typeof time !== 'string' || !time.includes(':')) {
+//    return "00:00 am";
+//  }
+
+//  const hours24 = Number(time.slice(0, 2));
+//  const minutes = time.slice(3, 5); // Preserve actual minutes dynamic input
+  
+  // Determine am vs pm
+//  const period = hours24 >= 12 ? "pm" : "am";
+  
+  // Convert hours to 12-hour format
+//  let hours12 = hours24 % 12;
+//  if (hours12 === 0) hours12 = 12; // Adjusts midnight (00) and noon (12) to 12
+  
+  // Format hours back into a 2-digit padded string
+//  const paddedHours = String(hours12).padStart(2, "0");
+  
+//  return `${paddedHours}:${minutes} ${period}`;
+//}