diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..2e19536d8 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,13 +1,19 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// I think that the first letter of the string will be upper case and then the .slice method will extract a part of a string and return the extracted part, being --> apitalise.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+// function capitalise is already a variable and let str is decalring that variable again but str already exists.
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
+//function capitalise(str) {
+  //let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  //return str;
+//}
 
 // =============> write your explanation here
 // =============> write your new code here
+
+function capitalise(str) {
+  return `${str[0].toUpperCase()}${str.slice(1)}`;
+}
\ No newline at end of file
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..56a150095 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -2,19 +2,28 @@
 
 // Why will an error occur when this program runs?
 // =============> write your prediction here
+// You cannot re-declare decimalNumber, it already exists as a parameter.
 
 // 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
+// We have to remove the re-declaration and pass a value into the function, then log the result of the fucntion.
 
 // Finally, correct the code to fix the problem
 // =============> 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..9c58c0d79 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..
 // this function should square any number but instead we're going to get an error
 
 // =============> write your prediction of the error here
+// You cannot put a number as a function parameter name
 
-function square(3) {
-    return num * num;
-}
+//function square(3) {
+    //return num * num;
+//}
 
 // =============> write the error message here
-
+// SyntaxError: Unexpected number
 // =============> explain this error message here
-
+// The "Unexpected number" error arises when a numeral is improperly positioned or used within your JavaScript code.
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+function square(num) {
+    return num * num;
+}
 
 
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..cd5f9d969 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,14 +1,21 @@
 // Predict and explain first...
 
 // =============> write your prediction here
+// the first console.log cant be there as it has to be a return.
 
-function multiply(a, b) {
-  console.log(a * b);
-}
+// function multiply(a, b) {
+ // console.log(a * b);
+// }
 
-console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
+// console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
-
+// It prints the number 320 in the terminal then undefined,
 // Finally, correct the code to fix the problem
 //  =============> 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)}`);
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcf..b966d68a1 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,13 +1,20 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// after the return it exists the function so it ever reaches a + b.
+//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
+// however it did still , print The sum of 10 and 32 is undefined
 // 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..12ea0afd7 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -2,23 +2,39 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//  The function does not take a parameter.
+//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
+// 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
+// This happens because the functionn does not accept a parameter, it always uses the global variable num and the arguments passed in (42, 105, 806) are ignored.
 // 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)}`);
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// here is the output with the code corrects 
+// the last digit of 42 is 2
+//The last digit of 105 is 5
+//The last digit of 806 is 6
\ No newline at end of file
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..7639c8a7f 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,6 @@
 // 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
+    const bmi = weight / (height * height);
+  return Number(bmi.toFixed(1));
 }
\ 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..1842558be 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -4,13 +4,19 @@
 // UPPER_SNAKE_CASE means taking a string and writing it in all caps with underscores instead of spaces.
 
 // Implement a function that:
+const sentence = "The quick brown fox jumps over the lazy dog.";
 
+console.log(sentence.toUpperCase());
+// Expected output: "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG."
 // Given a string input like "hello there"
 // When we call this function with the input string
 // it returns the string in UPPER_SNAKE_CASE, so "HELLO_THERE"
+const sentence2 = "The quick brown fox jumps over the lazy dog.";
 
+console.log(sentence2.toUpperCase().replace(/\./g, "_").replace(/ /g, "_"));
 // Another example: "lord of the rings" should be "LORD_OF_THE_RINGS"
 
+// Expected output: "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG."
 // 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
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a70..7df30802e 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,24 @@
 // 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 7c98eb0e8..5df4a752d 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -11,6 +11,7 @@ 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
 
@@ -18,17 +19,24 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// its called 3 times.
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
+// formatTimeDisplay(61);
 
 // b) What is the value assigned to num when pad is called for the first time?
 // =============> write your answer here
+// 0
 
 // c) What is the return value of pad is called for the first time?
 // =============> 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
+// The last call is pad(remainingSeconds) and i worked out that remainingSeconds = 1, so because 61 seconds leaves 1 second after dividing by 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
+// "01" the reason being: padStart(2, "0") adds a zero to the front because the string length is only 1. 
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..c922b575f 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -2,24 +2,66 @@
 // 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));
+  //if (hours > 12) {
+   // return `${hours - 12}:00 pm`;
+  //}
+  //return `${time} am`;
+//}
+
+//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: ${targetOutput2}`
+//);
+
+// Corrected version
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5);
+
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+
+  if (hours === 12) {
+    return `12:${minutes} pm`;
+  }
+
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${hours - 12}:${minutes} pm`;
   }
+
   return `${time} am`;
 }
 
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
+// Test Multiple PM conversions
+console.assert(
+  formatAs12HourClock("13:15") === "1:15 pm",
+  "13:15 failed"
+);
+
+console.assert(
+  formatAs12HourClock("18:45") === "6:45 pm",
+  "18:45 failed"
+);
+
 console.assert(
-  currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${targetOutput}`
+  formatAs12HourClock("21:10") === "9:10 pm",
+  "21:10 failed"
 );
 
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
+// Boundary tests
 console.assert(
-  currentOutput2 === targetOutput2,
-  `current output: ${currentOutput2}, target output: ${targetOutput2}`
+  formatAs12HourClock("11:59") === "11:59 am",
+  "11:59 boundary failed"
 );