diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..9048e8cd7 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -9,5 +9,17 @@ function capitalise(str) {
   return str;
 }
 
+//because str is already existing parameter we can not declare let str again. 
+// we can  rename  the str to fix the problem. 
+
+
+function capitalise(str) {
+  let cap_str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return cap_str;
+}
+
+console.log(capitalise("khilola"));
+
+
 // =============> write your explanation here
 // =============> write your new code here
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..10380e641 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -15,6 +15,16 @@ function convertToPercentage(decimalNumber) {
 console.log(decimalNumber);
 
 // =============> write your explanation here
+// decimalNumber is already a function parameter, so it's already declared in the function's scope.
+
+
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+
+  return percentage;
+}
+
+console.log(50);
\ No newline at end of file
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cf..efb489e6e 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -3,18 +3,34 @@
 
 // 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 
+
+// =============> the parameter can not be a number
+// Valid JavaScript Identifiers
+// Must start with a letter (a-z, A-Z), underscore (_), or dollar sign ($).
+// Cannot start with a number (0-9).
+// Can contain letters, numbers, underscores, or dollar signs after the first character.
+// Cannot be a reserved keyword (e.g., if, else, function, return).
+
+
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+// function square(3) {return num * num }
 
 // =============> explain this error message here
-
+// 3 is not approprate parametr name.
+// num is not defined, 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
+ //function square(num){
+ //return num*num ; 
+ //}
+
+ //console.log(square(4));
 
 
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..f89c4426a 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -12,3 +12,8 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // 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)}`);
\ 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..912914af6 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -9,5 +9,13 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+//The return; statement ends the function immediately.
+//The next line (a + b;) is never executed because it's after the return and on a new line.
 // 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-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc3..51eb80f96 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -14,11 +14,23 @@ 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
+// =============> write the output here 
+//every time we run it we will get same answer 3
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+ //it will only use global num=103
+
 // 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
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..b706dfc4a 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -16,4 +16,16 @@
 
 function calculateBMI(weight, height) {
     // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+}
+
+
+function calculateBMI(weight, height) {
+    const bmi = weight / (height * height); //calculates the BMI
+    return parseFloat(bmi.toFixed(1)); // to ensure the result is rounded to 1 decimal place.
+}// parselFloat converts the result back to a number from string.
+
+
+console.log(calculateBMI(70, 1.73));
+
+//
+
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad..a6612a87f 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 toUpperSnakeCase (inputString) {
+    return inputString.toUpperCase().replaceAll(" ", "_");
+}
+console.log(toUpperSnakeCase("hello there"));         // "HELLO_THERE"
+console.log(toUpperSnakeCase("lord of the rings"));   //"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..d5b79d902 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,25 @@
 // 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}`;
+}
+
+// checking with different inputs
+
+console.log(toPounds("399p")); // £3.99
+console.log(toPounds("7p"));   // £0.07
+console.log(toPounds("62p"));  // £0.62
+console.log(toPounds("400p")); // £4.00
+console.log(toPounds("3p"));   // £0.03
\ 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..bac9c1fe8 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -18,17 +18,22 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// pad is going to be called 3 times. 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 because 61 seconds is less then hours
 
 // 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
+// 1 last call  as 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
+//"01" because pad(1) - "1".padStart(2,"0")-"01"
\ No newline at end of file
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..0c9763cf8 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -5,7 +5,8 @@
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${hours - 12}:00 pm`; //This hardcodes :00, losing the original minutes from the time input. 
+    //Even original minutes aren't 00 it will always return :00
   }
   return `${time} am`;
 }
@@ -23,3 +24,24 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+// new fixed code
+function formatAs12HourClock(time) {
+  const [hourStr, minute] = time.split(":");
+  const hours = Number(hourStr);
+
+  const isPM = hours >= 12;
+  const displayHour = hours % 12 === 0 ? 12 : hours % 12;
+  const suffix = isPM ? "pm" : "am";
+
+  return `${String(displayHour).padStart(2, "0")}:${minute} ${suffix}`;
+}
+console.assert(
+  formatAs12HourClock("23:00") === "11:00 pm",
+);
+console.assert(
+  formatAs12HourClock("00:00") === "12:00 am",
+);
+console.assert(
+  formatAs12HourClock("12:00") === "12:00 pm",
+);
\ No newline at end of file