diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..29c6cc3c2 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,13 +1,22 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> the code gives an error because there is a variable declaration with the same name as the parameter of the function.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  let newStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return newStr;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+
+// =============> write your explanation here: The error is occurring because the variable newStr is declared inside the function capitalise, 
+// but it is being accessed outside the function.
+
+// =============> write your new code here: 
+  function capitalise(str) {
+  let newStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return newStr;
+  }
+   let newStr = capitalise("hello");
+   console.log(newStr);
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..30147aa27 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -1,20 +1,28 @@
-// Predict and explain first...
+// Predict and explain first: Decimalnumber is already declared as a parameter of the function convertToPercentage, 
+// so when we try to declare it again inside the function, it will give an error.
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here : The error will occur because we are trying to declare a variable with the same name as the parameter of the function.
 
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
+  
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.5));
 
-// =============> write your explanation here
+// =============> write your explanation here : I removed the variable variation inside the function and directly calculated the percentage.
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> write your new code here :function convertToPercentage(decimalNumber) {
+  
+ // const percentage = `${decimalNumber * 100}%`;
+
+ // return percentage;
+// }
+
+//console.log(convertToPercentage(0.5));
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cf..9ace2f4b8 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -1,20 +1,23 @@
 
-// Predict and explain first BEFORE you run any code...
+// Predict and explain first BEFORE you run any code: the function is supposed to return the square of the number.
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here: Maybe because we used a number instead of a variable inside the function declaration.
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+//    return num * num;
+// }
 
-// =============> write the error message here
+// =============> write the error message here : syntax error: Unexpected number (3)
 
-// =============> explain this error message here
+// =============> explain this error message here: we shouldn't use a number as a parametre name of the function.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
+function square(num) {
+    return num*num;
+}
+console.log(square(3));
 
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..5f52aa414 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,6 +1,6 @@
-// Predict and explain first...
+// Predict and explain first: This function is supposed to multiply two numbers and return the result. 
 
-// =============> write your prediction here
+// =============> write your prediction here : The result will be the multiplication of the two numbers.
 
 function multiply(a, b) {
   console.log(a * b);
@@ -8,7 +8,12 @@ function multiply(a, b) {
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here : The function is logging the result of the console.log statement
+// but it is not returning any value. That's because we are using console.log instead of return in the function. 
 
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> write your new code here :
+//  function multiply(a, b) {
+//  return a * b;
+//  }
+//  console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
\ No newline at end of file
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcf..f9b50820b 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,13 +1,17 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: The function will not return the sum of a and b because there is a syntax error.
 
-function sum(a, b) {
-  return;
-  a + b;
-}
+// function sum(a, b) {
+//   return;
+//   a + b;
+// }
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+//console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here : return should be on the same line as a + b.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function sum (a,b){
+  return a+b;
+}
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
\ No newline at end of file
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc3..8fefd5359 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,24 +1,30 @@
-// Predict and explain first...
+// Predict and explain first...: the function is supposed to return the last digit of a number, 
+// but it won't because it's using a fixed number instead of a variable to get the last digit from.
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here : it will give the same last digits of the same number (3).
 
-const num = 103;
+// const num = 103;
 
-function getLastDigit() {
-  return num.toString().slice(-1);
-}
+// function getLastDigit() {
+//   return num.toString().slice(-1);
+// }
 
-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)}`);
+// 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)}`);
 
 // Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
-// =============> write your explanation here
+// =============> write the output here : It gave the same last digit for all the numbers, which is 3.
+// Explain why the output is the way it is : because the function is using a fixed number (103) .
+// =============> write your explanation here: because the function is using a fixed number (103) .
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> write your new code here 
+ function getLastDigit(num) {
+ return num.toString().slice(-1);}
+ 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)}`);
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..ceec0f314 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,7 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-    // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+  let Bmi= weight / (height*height);
+ return Bmi.toFixed(1);
+}
+console.log(calculateBMI (85, 1.851));
\ No newline at end of file
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad..991431a8f 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,9 @@
 // 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 convertToUpperSnakeCase(str){
+    return str.toUpperCase().replaceAll(" ", "_");
+ }
+ console.log(convertToUpperSnakeCase("hello there"));
+ console.log(convertToUpperSnakeCase("lord of the rings"));
\ No newline at end of file
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a70..d6b161c9e 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,26 @@
 // 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}`);
+
+}
+console.log(toPounds("43p"));
+console.log(toPounds("399p"));
+console.log(toPounds("300098p"));
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8..1725f629f 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -10,25 +10,25 @@ function formatTimeDisplay(seconds) {
 
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
-
+console.log(formatTimeDisplay(61));
 // You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
 // to help you answer these questions
 
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> write your answer here : 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
+// =============> write your answer here : 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here : 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
+// =============> write your answer here: 01, because it the remaining of 61/60.
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> write your answer here: 01, it's the remainder of 61/60, and it is padded to 2 digits.
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..9af0e86b0 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -1,25 +1,29 @@
 // This is the latest solution to the problem from the prep.
 // Make sure to do the prep before you do the coursework
 // Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
-
+ 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5);
+
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  if (hours === 12) {
+    return `12:${minutes} pm`;
+  }
+
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${String(hours - 12).padStart(2, "0")}:${minutes} pm`;
   }
+
   return `${time} am`;
 }
+console.log(formatAs12HourClock("00:00"));
+console.log(formatAs12HourClock("01:00"));
+console.log(formatAs12HourClock("11:00"));
+console.log(formatAs12HourClock("12:00"));
+console.log(formatAs12HourClock("13:00"));
+console.log(formatAs12HourClock("23:00"));
 
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
-console.assert(
-  currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${targetOutput}`
-);
-
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
-console.assert(
-  currentOutput2 === targetOutput2,
-  `current output: ${currentOutput2}, target output: ${targetOutput2}`
-);