diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a07..287e3f3e9b 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -4,10 +4,21 @@
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
 
+////////  error code /////
+
+// function capitalise(str) {
+//   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
+//   return str;
+// }
+
+// fix code //
 function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
+  let string = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return string;
 }
+console.log(capitalise("hello js error"));
 
 // =============> write your explanation here
 // =============> write your new code here
+
+// The Error was syntax error as "str" has already been declared and we can't declare it again as variable name. Now I declare a new variable name  and assign value.
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f4..d5afc4cd60 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -3,16 +3,18 @@
 // Why will an error occur when this program runs?
 // =============> write your prediction here
 
+// There will be two errors, First syntax errors as decimalNumber has already been declared and tried to redeclare it again inside function.
+// second without defining decimalNumber try to use decimalNumber in log.
+
 // Try playing computer with the example to work out what is going on
 
 function convertToPercentage(decimalNumber) {
-  const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
 
   return percentage;
 }
 
-console.log(decimalNumber);
+console.log(convertToPercentage(0.9));
 
 // =============> write your explanation here
 
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cfe..b79fb9bae2 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -1,4 +1,3 @@
-
 // Predict and explain first BEFORE you run any code...
 
 // this function should square any number but instead we're going to get an error
@@ -6,15 +5,20 @@
 // =============> write your prediction of the error here
 
 function square(3) {
-    return num * num;
+  return num * num;
 }
 
 // =============> write the error message here
+// SyntaxError: Unexpected number
 
 // =============> explain this error message here
+//  syntax error as function does not allow actual value as a parameter
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
-
+function square(num) {
+  return num * num;
+}
+console.log(square(2));
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b417..af864ffb04 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -10,5 +10,12 @@ console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
 
+// first log will show result by multiplying but second log will not show any result instead will show undefined because we did not say the code
+// what to do and what should return.
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function multiply(a, b) {
+  return a * b;
+}
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcfd..358cbedd95 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,6 +1,8 @@
 // Predict and explain first...
 //  =============> write your prediction here
 
+//  It will show undefined
+
 function sum(a, b) {
   return;
   a + b;
@@ -9,5 +11,11 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// the reason is that I did not write anything inside return that's why return can't find anything to return
+
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function sum(a, b) {
+  return a + b;
+}
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc35..88602f1379 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -2,6 +2,7 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+//  I predicted that  it will show undefined or fixed number like 3
 
 const num = 103;
 
@@ -15,10 +16,24 @@ 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
+// num has fix number which is 3 and i return this fix number
 // =============> write your explanation here
+// user want last digit whatever number they put but i set up a fix number which will return that one that's why now i removed fixed number and wrote a parameter in function
+// which will contain user number whatever number they put and get the last digit.
 // 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 17b1cbde1b..2075b159ea 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,11 @@
 // 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
-}
\ No newline at end of file
+  let allHeight = Number(height * height);
+  let heightWeight = Number(weight / allHeight);
+  let oneDecimal = heightWeight.toFixed(1);
+  return oneDecimal;
+
+  // return the BMI of someone based off their weight and height
+}
+console.log(calculateBMI(78, 1.77));
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad9..2f665fe52e 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 UpperSnake(string) {
+  let upper = string.toUpperCase().split(" ").join("_");
+  return upper;
+}
+console.log(UpperSnake("hello py"));
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a703..1d1527cda0 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,27 @@
 // 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");
+
+  let poundPence = `£${pounds}.${pence}`;
+
+  return poundPence;
+}
+console.log(toPounds("223p"));
+console.log(toPounds("43p"));
+console.log(toPounds("129p"));
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 17127bc01e..2d6a98d9a8 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -15,6 +15,8 @@ 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
 
@@ -22,17 +24,22 @@ function formatTimeDisplay(seconds) {
 
 // a) When formatTimeDisplay is called how many times will pad be called?
 // =============> write your answer here
+// Answer : three times
 
 // 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
+//  answer : 0
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
+// Answer : 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
-
+// answer : 1 and when pad is called, it is called remainingSecond as argument. when formatDisplay runs(61) then 61 divided by 60 and remaining number is 1,which passed to num, so the value of num 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
+// answer:  01. return value is zero one because first received it one then pad formatted this number with two length.
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b8..2bbdbf1384 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -4,10 +4,16 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const mint = time.slice(-2);
   if (hours > 12) {
     return `${hours - 12}:00 pm`;
+  } else if (hours === 0) {
+    return `12:${mint} am`;
+  } else if (hours === 12) {
+    return `12:${mint} pm`;
+  } else {
+    return `${time} am`;
   }
-  return `${time} am`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
@@ -16,10 +22,35 @@ 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}`
 );
+
+const currentOutput3 = formatAs12HourClock("00:00");
+const targetOutput3 = "12:00 am";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput2}, target output: ${targetOutput2}`
+);
+
+const currentOutput4 = formatAs12HourClock("16:00");
+const targetOutput4 = "04:00 pm";
+console.assert(
+  currentOutput4 === targetOutput4,
+  `current output: ${currentOutput2}, target output: ${targetOutput2}`
+);
+
+const currentOutput5 = formatAs12HourClock("20:00");
+const targetOutput5 = "08:00 pm";
+console.assert(
+  currentOutput5 === targetOutput5,
+  `current output: ${currentOutput2}, target output: ${targetOutput2}`
+);
+
+console.log(formatAs12HourClock("08:00"));
+console.log(formatAs12HourClock("23:00"));
+console.log(formatAs12HourClock("00:00"));
+console.log(formatAs12HourClock("16:00"));