diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..949b92dd8 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,13 +1,21 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> we declare a variable str twice
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
-function capitalise(str) {
+/*function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
-
-// =============> write your explanation here
+*/
+// =============> write your explanation here 
+// The error occurs because we are trying to declare a variable 'str' inside the function using 'let',
 // =============> write your new code here
+
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+
+console.log(capitalise("beatriz")); // Output: "Beatriz"
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..e8c190b72 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -1,20 +1,30 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here - will not run because decimalNumber is declared twice
 
 // Try playing computer with the example to work out what is going on
 
-function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
-  const percentage = `${decimalNumber * 100}%`;
+//function convertToPercentage(decimalNumber) {
+//  const decimalNumber = 0.5;
+//  const percentage = `${decimalNumber * 100}%`;
 
-  return percentage;
-}
+//  return percentage;
+//}
 
-console.log(decimalNumber);
+//console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> write your explanation here - An error occur because we are declaring the decimalNumber variable twice.
+//we declare it in the function and in the first const.
+//we are also logging decimalNumber we should log the function 
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage() {
+  const decimalNumber = 0.5;
+  const percentage = `${decimalNumber * 100}%`; 
+
+  return percentage;
+}
+console.log(convertToPercentage());
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cf..8c7008a8c 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -3,18 +3,26 @@
 
 // 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 - I believe that square is not valid because 3 is not a valid variable 
 
-function square(3) {
-    return num * num;
-}
+//ORIGINAL CODE
+//function square(3) {
+//    return num * num;
+//}
+//console.log(square(3));
 
-// =============> write the error message here
+// =============> write the error message here - SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> explain this error message here - the number 3 is not a valid parameter name. It has to be a name and not a number.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+    return num * num;
+}
+console.log(square(38));
+
+//With this code, we can chose any number to square
 
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..898a6326c 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,14 +1,32 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+  // we have a function that multiplies two numbers and logs the result,
 
-function multiply(a, b) {
+
+/*function multiply(a, b) {
   console.log(a * b);
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+*/
 
 // =============> write your explanation here
+  //we have the console doing the multiplication and loggin it, but we 
+//are not returning anything from the funcntion. there's why the output is undefined.
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+function multiply(a, b) {
+  console.log(a * b);
+  return a * b;
+}
+
+console.log(`The result of multiplying 27 and 39 is ${multiply(27, 39)}`);
+
+// Test 1 answer: 
+// 320
+// The result of multiplying 10 and 32 is 320
+// Test 2 answer: 
+// 1053
+// The result of multiplying 27 and 39 is 1053
\ 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..cac6abc3e 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,13 +1,27 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The function sum is intended to return the sum of two numbers, a and b. there's an error in the return statement. 
+// And again it's returning undefined because the return statement is divided. 
+// Ouput is the sum and then undefined
 
-function sum(a, b) {
+/*function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
-
+*/
 // =============> write your explanation here
+  // ERROR:The sum of 10 and 32 is undefined
+    // the return statement should have been written in one line as "return 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 59 and 72 is ${sum(59 , 72)}`);
+
+// Test 1 : The sum of 10 and 32 is 42
+// Test 2 : The sum of 59 and 72 is 131
\ 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..b4f123a83 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,9 +1,18 @@
 // Predict and explain first...
+  // The function getLastDigit is intended to return the last digit of a given number.
+  // We are declaring the given number as a constant variable 'num' with a value of 103.
+  // However, the function does not take any parameters and always uses the constant 'num'.
+  // Therefore, when we call getLastDigit with different numbers (42, 105, 806), 
+  // it still returns the last digit of 103, which is '3'.
+  
 
-// Predict the output of the following code:
+// Predict the output of the following code:  
 // =============> Write your prediction here
+    //  The last digit of 42 is 3
+    //  The last digit of 105 is 3
+    //  The last digit of 806 is 3
 
-const num = 103;
+/*const num = 103;
 
 function getLastDigit() {
   return num.toString().slice(-1);
@@ -12,13 +21,34 @@ function getLastDigit() {
 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
+    //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
+    // because we are declaring the num = 103, even if we change the parameter in the console it still considers the num value
 // Finally, correct the code to fix the problem
 // =============> 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)}`);
+
+
+//NEW OUTPUT
+    //The last digit of 42 is 2
+    //The last digit of 105 is 5
+    //The last digit of 806 is 6
+
 // 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..cb7c8c952 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -16,4 +16,9 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+return (weight / (height * height)).toFixed(1);
+} 
+
+/* module.exports = calculateBMI; */
+
+console.log(calculateBMI(70, 1.73));    // Expected output: 23.4
\ 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..eccb6805c 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,13 @@
 // 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
+
+export function toUpperSnakeCase(inputString) {
+  // Replace spaces with underscores
+  const stringWithUnderscores = inputString.replace(/ /g, '_'); // / /g means that is replacing all spaces globally with _ 
+  // Convert the string to uppercase
+  const upperSnakeCaseString = stringWithUnderscores.toUpperCase();
+  return upperSnakeCaseString;
+}
+console.log(toUpperSnakeCase("hello there")); // "HELLO_THERE"
+console.log(toUpperSnakeCase("lord of the rings")); // "LORD_OF_THE_RINGS"
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a70..1399ef8ef 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,35 @@
 // 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) {
+  // Remove the trailing 'p' from the input string
+  const penceStringWithoutTrailingP = penceString.substring(
+    0,
+    penceString.length - 1
+  );
+
+  // Pad with leading zeros to ensure we have at least 3 digits
+  const paddedPenceNumberString = penceStringWithoutTrailingP.padStart(3, "0");
+  
+  // Extract pounds (all digits except the last two)
+  const pounds = paddedPenceNumberString.substring(
+    0,
+    paddedPenceNumberString.length - 2
+  );
+
+  // Extract pence (last two digits) and ensure it has exactly 2 digits
+  const pence = paddedPenceNumberString
+    .substring(paddedPenceNumberString.length - 2)
+    .padEnd(2, "0");
+
+  // Return the formatted result
+  return `£${pounds}.${pence}`;
+}
+
+// Tested the function with different inputs
+console.log(toPounds("399p")); // £3.99
+console.log(toPounds("199p")); // £1.99
+console.log(toPounds("50p"));  // £0.50
+console.log(toPounds("5p"));   // £0.05
+console.log(toPounds("1234p")); // £12.34
\ No newline at end of file
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8..d8b22ab51 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -11,24 +11,33 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(61)); // Expected output: "00:01:01"
 // 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
+// =============> 3 - for hours, minutes and seconds.
 
 // 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
+// =============> 0 (totalHours = 0 when input is 61 seconds)
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> "00" (0 padded to 2 digits becomes "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
+// =============> 1 (remainingSeconds = 61 % 60 = 1)
 
 // 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
+// =============> return value is "01". 
+/*Explanation:
+num = 1 (remainingSeconds)
+
+num.toString() converts 1 to "1"
+
+.padStart(2, "0") pads "1" to 2 digits with leading zeros
+
+*/
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..e6e40894d 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -4,14 +4,26 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const minutes = time.slice(3, 5); // Get the minutes part
+  
+  let period = "am";
+  let displayHours = hours;
+  
+  if (hours === 0) {
+    displayHours = 12; // midnight
+  } else if (hours === 12) {
+    period = "pm";
+  } else if (hours > 12) {
+    displayHours = hours - 12;
+    period = "pm";
   }
-  return `${time} am`;
+  
+  return `${displayHours}:${minutes} ${period}`;
 }
 
+// Test cases
 const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
+const targetOutput = "8:00 am";
 console.assert(
   currentOutput === targetOutput,
   `current output: ${currentOutput}, target output: ${targetOutput}`
@@ -23,3 +35,10 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+console.log("If no errors were logged, all tests passed!");
+
+// Export correctly - choose ONE of these:
+module.exports = formatAs12HourClock; // Direct export
+// OR if you want named exports:
+// module.exports = { formatAs12HourClock };
\ No newline at end of file