diff --git a/Sprint-3/1-key-errors/0.js b/Sprint-3/1-key-errors/0.js
index 653d6f5a0..7d2965c9c 100644
--- a/Sprint-3/1-key-errors/0.js
+++ b/Sprint-3/1-key-errors/0.js
@@ -1,13 +1,23 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  It would fail at line 2 with either syntax or reference errors =============> write your prediction here
 
 // call the function capitalise with a string input
-// interpret the error message and figure out why an error is occurring
+// 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;
 }
+console.log(capitalise("beautiful"));
+
+// write your explanation here:
+// Syntax Error: Identifier 'Str' has been already been declared/assigned
+// The error means Str had already been identified in the function capitalise(str). Let str is assigning a second value which is causing that error message
 
-// =============> write your explanation here
 // =============> write your new code here
+
+function capitalise(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+console.log(capitalise("beautiful"));
diff --git a/Sprint-3/1-key-errors/1.js b/Sprint-3/1-key-errors/1.js
index f2d56151f..73817f5d3 100644
--- a/Sprint-3/1-key-errors/1.js
+++ b/Sprint-3/1-key-errors/1.js
@@ -1,7 +1,8 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// write your prediction here
+// This is because the variable name for the parameter and the cont is the same
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +15,18 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+//=============> write your explanation here
+//The decimalNumber is declared twice as a result, calling convertToPercentage function and passing a value gets assigned to parameter decimalNumber
+//So i had to move it outside of the function scope to remove restrictions
 
-// Finally, correct the code to fix the problem
+// Finally, correct the code to fix the problem.
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+const decimalNumber = 0.5;
+
+console.log(decimalNumber);
diff --git a/Sprint-3/1-key-errors/2.js b/Sprint-3/1-key-errors/2.js
index aad57f7cf..0fb0fefa0 100644
--- a/Sprint-3/1-key-errors/2.js
+++ b/Sprint-3/1-key-errors/2.js
@@ -1,20 +1,25 @@
-
 // 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
+// Unidentified function error due to a random number =============> write your prediction of the error here
 
-function square(3) {
-    return num * num;
-}
+//function square(num) {
+//return square = num * num;
+//}
 
-// =============> write the error message here
+// Syntax errorError Unexpected number.=============> write the error message here
 
-// =============> explain this error message here
+// Means Function identifier should be a name not a number =============> explain this error message here.
+// Whats the difference between function identifier and parameter?
+// The parameter of a function must be name not number. So Parsing number 3 into the parameter would throw an error.
+// Changing number 3 to 'num' as a placeholder fixes the error
 
 // 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-3/2-mandatory-debug/0.js b/Sprint-3/2-mandatory-debug/0.js
index b27511b41..9b2aba501 100644
--- a/Sprint-3/2-mandatory-debug/0.js
+++ b/Sprint-3/2-mandatory-debug/0.js
@@ -1,6 +1,6 @@
-// Predict and explain first...
+// Predict and explain first....
 
-// =============> write your prediction here
+// Code will fail because a , b are not declared values or double function values=============> write your prediction here
 
 function multiply(a, b) {
   console.log(a * b);
@@ -9,6 +9,14 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+//The 2nd console log returned value value is undefined. I have added a return function to output the multiply value.
+//The value returned by the function was undefined because the value hasn't been stored anywhere, and there's no return to return the value to the function call.
 
-// Finally, correct the code to fix the problem
+//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 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..a8339e4a6 100644
--- a/Sprint-3/2-mandatory-debug/1.js
+++ b/Sprint-3/2-mandatory-debug/1.js
@@ -1,5 +1,6 @@
-// Predict and explain first...
+// Predict and explain first....
 //  =============> write your prediction here
+// I think code will run without an error although not entirely sure what the empty return; will return
 
 function sum(a, b) {
   return;
@@ -9,5 +10,11 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// The return statement was placed before the expression hence the undefined outcome. The parsed argument is not receiving output.
+
 // 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..40200ff44 100644
--- a/Sprint-3/2-mandatory-debug/2.js
+++ b/Sprint-3/2-mandatory-debug/2.js
@@ -2,23 +2,33 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
-
-const num = 103;
+//I think const being declared before function may cause a problem on returning num value (line 10)
 
 function getLastDigit() {
+  const num = 103;
   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)}`);
 
-// Now run the code and compare the output to your prediction
+// Now run the code and compare the output to your prediction.
 // =============> write the output here
+// My prediction was close regarding line 10 as the value of num is not returned.
 // Explain why the output is the way it is
 // =============> write your explanation here
+// The code has returned 3 as the last digit for all provided numbers because num value is restricted to 103 as value and can't be used outside the function
+// Also function getLastDigit() has no parameter set
 // 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 ${getLastDigit(806)}`);
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
+// getLastDigit was no working as variable num was taking precedence
diff --git a/Sprint-3/3-mandatory-implement/1-bmi.js b/Sprint-3/3-mandatory-implement/1-bmi.js
index 58b1085f1..3b60ee513 100644
--- a/Sprint-3/3-mandatory-implement/1-bmi.js
+++ b/Sprint-3/3-mandatory-implement/1-bmi.js
@@ -17,3 +17,12 @@
 function calculateBMI(weight, height) {
   // return the BMI of someone based off their weight and height
 }
+
+function calculateBMI(weight, height) {
+  //return (weight / height).toFixed(1); - 1st attempt
+  //return (weight / (height * height)).toString().slice(0, 4); - 2nd attempt
+  return "${(weight / (height * height)).toFixed(1)}";
+}
+
+console.log(`the bmi of 70 and 2.99 is ${calculateBMI(70, 2.99)}`);
+console.log(`the bmi of 90 and 1.96 is ${calculateBMI(90, 1.96)}`);
diff --git a/Sprint-3/3-mandatory-implement/2-cases.js b/Sprint-3/3-mandatory-implement/2-cases.js
index 5b0ef77ad..3fe4abe90 100644
--- a/Sprint-3/3-mandatory-implement/2-cases.js
+++ b/Sprint-3/3-mandatory-implement/2-cases.js
@@ -14,3 +14,16 @@
 // 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 toUpperSnakeCase(text) {
+  // return text.trim().replace(/\s+/g, "_").toUpperCase(); - first attempt that inserted underscore
+  return text.toUpperCase().replaceAll(" ", "_");
+}
+
+const text = toUpperSnakeCase("Hello there");
+console.log(text);
+
+// Trim and regex pattern was the only saving grace I came across to resolve the underscore issue I had spent hours researching.
+// I have however now modified and replaced the pattern for easy understanding with AI's help
+// CodeYourFuture AI Usage Guide reviewed again
diff --git a/Sprint-3/3-mandatory-implement/3-to-pounds.js b/Sprint-3/3-mandatory-implement/3-to-pounds.js
index 10754da73..e270166de 100644
--- a/Sprint-3/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-3/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,47 @@
 // 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}`);*/
+
+// Revised code:
+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("499p"));
+console.log(toPounds("1009p"));
+console.log(toPounds("2999p"));
+
+// updated function name
diff --git a/Sprint-3/4-mandatory-interpret/time-format.js b/Sprint-3/4-mandatory-interpret/time-format.js
index c0dd9c9a5..30265787e 100644
--- a/Sprint-3/4-mandatory-interpret/time-format.js
+++ b/Sprint-3/4-mandatory-interpret/time-format.js
@@ -22,17 +22,22 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// Pad will be called 3 times because of the 3 arguments
 
 // 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;
 
 // c) What is the return value of pad when it 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 value is 1 because the last pad argument is remainingSeconds. So 61 as the given seconds - remaining seconds = 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
+// The answer is 01 because of the final output for formatTimeDisplay(61) is 00:01:01. The assigned value of 1 with the length of 1, the numString = "0" + numString becomes 1