diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..ac455e67d 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,24 @@
 // Predict and explain first...
-//  =============> write your prediction here
+/*  =============> I predict that the function would make 1st character uppercase and 
+then adds the rest of the string using slice. */
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
+//We cannot declare str again because it has already been declared as a parameter of the function.
+
+/* OLD CODE
+
 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) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..cb5e75d5a 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -1,10 +1,11 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> We will get a SyntaxError as decimalNumber has already been declared as a 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}%`;
@@ -12,9 +13,17 @@ function convertToPercentage(decimalNumber) {
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(decimalNumber); */
 
 // =============> write your explanation here
+// We don't need to redeclare decimalNumber as it's value comes from function parameter, 
+// also console.log wont work as decimalNumber is only created inside the function. 
 
 // 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-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..1b52a029c 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -3,18 +3,22 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> SyntaxError because function parameter must be a name not a number or value. The error occurs because 3 is a number.
 
+/*
 function square(3) {
     return num * num;
-}
+} */
 
-// =============> write the error message here
+// =============> SyntaxError: Unexpected number
 
-// =============> explain this error message here
+// =============> This error message is cause by trying to assign a number as a parameter, a parameter needs to be identifier such as num.
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
-
+function square(num) {
+    return num * num;
+}
+console.log(square(5))
 
diff --git a/Sprint-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..5b64d853b 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,14 +1,24 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> We will log the result in a console but function won't return it as a value.
+// console.log only displays the result, it does not return it from the function.
 
+/*
 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
 
+//We need to return a * b so the result can be used where the function is called.
+
 // 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-3/2-mandatory-debug/1.js b/Sprint-3/2-mandatory-debug/1.js
index 37cedfbcf..38b99b4ed 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,13 +1,20 @@
 // Predict and explain first...
-//  =============> write your prediction here
-
+//  =============> return on its own means that the function ends without returning a value, so the result is undefined.
+/*
 function sum(a, b) {
   return;
   a + b;
 }
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+*/
 
 // =============> write your explanation here
+// return on it's own means that the function wont refer to parameters and will come up as undefined. a+ b is never reached because it comes after return.
 // 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)}`);
diff --git a/Sprint-3/2-mandatory-debug/2.js b/Sprint-3/2-mandatory-debug/2.js
index 57d3f5dc3..90e6423c4 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -1,8 +1,11 @@
 // Predict and explain first...
 
 // 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;
 
 function getLastDigit() {
@@ -12,13 +15,31 @@ 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
+//The output is this way as there is a num assigned before the function and function don't use the parameter num,
+//so the output would only be the return of slice value for const num before the function.
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+const num = 103;
+
+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
+//Function was not working correctly as it was returning num slice for const num that was assigned before the function, function should use parameter num to work correctly.
\ No newline at end of file
diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..e9c9f02b4 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,9 @@
 // It should return a string of their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
-  // return the BMI of someone based off their weight and height
+  let bmiNum = weight / (height * height)
+  bmiNum=bmiNum.toFixed(1)
+  return bmiNum
 }
+
+console.log(calculateBMI(70,1.73));
diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..5414a655b 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -14,3 +14,10 @@
 // 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
+
+const str= "hello there"
+
+function strToUpperCase(str) {
+    return str.toUpperCase().replaceAll(" ","_")
+}
+console.log(strToUpperCase("lord of the rings"));
\ No newline at end of file
diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..358f827ce 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,46 @@
 // 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
+
+// In Sprint-1, there is a program written in 3-mandatory-interpret/3-to-pounds.js
+
+// You will need to take this code and turn it into a reusable block of code.
+// 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
+
+
+/*
+const penceString = "399p";
+
+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");
+
+console.log(`£${pounds}.${pence}`);
+*/
+
+function toPounds(penceString) {
+    let noP = penceString.substring(0,penceString.length -1)
+    let paddedP = noP.padStart(3,"0")
+    let pounds= paddedP.substring(0, paddedP.length -2)
+    
+    let pence= paddedP.substring(paddedP.length -2).padEnd(2,"0")
+
+    return `£${pounds}.${pence}`
+}
+console.log(toPounds("399p"))
+console.log(toPounds("5p"))
+console.log(toPounds("52p"))
+console.log(toPounds("1244p"))
\ No newline at end of file
diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index c0dd9c9a5..cc5a52b36 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -15,24 +15,26 @@ 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
+// =============> pad function will be called 3 times because it's been called 3 times in return statement.
 
 // 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
+// =============>  Starting value is 0
 
 // c) What is the return value of pad when it is called for the first time?
-// =============> write your answer here
+// =============> returning value of pad when its called for the 2nd time is "00" :numString = "0" + numString:
 
 // 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
+// =============> When pad is called for the last time it's value is 1, The last call is pad(remainingSeconds), and remainingSeconds is 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
+// =============> // Return value is "01", num is 1, which becomes "1". Since its length is less than 2, the while loop adds "0" to the beginning, making it "01".
diff --git a/Sprint-3/5-stretch-extend/format-time.js b/Sprint-3/5-stretch-extend/format-time.js
index 32a32e66b..57d853ff4 100644
--- a/Sprint-3/5-stretch-extend/format-time.js
+++ b/Sprint-3/5-stretch-extend/format-time.js
@@ -4,8 +4,13 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = Number(time.slice(3, 5));
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${(hours - 12).toString().padStart(2, "0")}:${minutes.toString().padStart(2, "0")} pm`;
+  } else if (hours === 12) {
+    return `${hours}:${minutes.toString().padStart(2, "0")} pm`;
+  } else if (hours === 0) {
+    return `12:${minutes.toString().padStart(2, "0")} am`;
   }
   return `${time} am`;
 }
@@ -14,12 +19,63 @@ const currentOutput = formatAs12HourClock("08:00");
 const targetOutput = "08:00 am";
 console.assert(
   currentOutput === targetOutput,
-  `current output: ${currentOutput}, target output: ${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}`
+  `current output: ${currentOutput2}, target output: ${targetOutput2}`,
 );
+
+formatAs12HourClock("19:00");
+let output = formatAs12HourClock("19:00");
+let target = "07:00 pm";
+console.assert(
+  output === target,
+  `current output: ${output}, target output: ${target}`,
+);
+console.log(formatAs12HourClock("19:00"));
+// //works
+formatAs12HourClock("9:00");
+output = formatAs12HourClock("9:00");
+target = "9:00 am";
+console.assert(
+  output === target,
+  `current output: ${output}, target output: ${target}`,
+);
+console.log(formatAs12HourClock("9:00"));
+// //works
+formatAs12HourClock("12:00");
+output = formatAs12HourClock("12:00");
+target = "12:00 pm";
+console.assert(
+  output === target,
+  `current output: ${output}, target output: ${target}`,
+);
+
+console.log(formatAs12HourClock("12:00"));
+//Function needs else if statement to includes code behavior when "12:00" will be the argument value.
+
+console.log(formatAs12HourClock("9:00"));
+// //works
+formatAs12HourClock("00:00");
+output = formatAs12HourClock("00:00");
+target = "12:00 am";
+console.assert(
+  output === target,
+  `current output: ${output}, target output: ${target}`,
+);
+console.log(formatAs12HourClock("00:00"));
+//Function needs else if statement to includes code behavior when "00:00" will be the argument value.
+
+formatAs12HourClock("19:37");
+output = formatAs12HourClock("19:37");
+target = "07:37 pm";
+console.assert(
+  output === target,
+  `current output: ${output}, target output: ${target}`,
+);
+console.log(formatAs12HourClock("19:37"));
+//For the test to pass I had to create a minutes variable to extract the minutes from the input. When minutes were converted to a number, zero at the start of the string was removed, so padStart(2, "0") was used to add it back.