diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a07..fe55c658c6 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> my prediction is that this code is not functioning because of that it declared parameter in the function.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +9,9 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
-// =============> write your new code here
+// =============> write your explanation here : the error message is indicating that str already declared in the parameter and we can't redeclare it.
+/* =============> write your new code here
+                  function capitalise(str) {
+                   const capitalizeFirstLetter =`${str[0].toUpperCase()}${str.slice(1)}`;
+                   return capitalizeFirstLetter;
+                  }       */
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f4..2cf976d9c6 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-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 : /* my prediction is that parameter was declared inside the function
+//                                                 and also local variable can not be logged globally.  */
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +15,16 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> write your explanation here : /* in this code the computer first read the function and
+//                                                 and store the variables and try to execute the function in case of the
+//                                                 above code the computer first take the parameter and do the next step
+//                                                 it reads the const decimalNUmber that is error so it will execute
+//                                                 identifier error.  */
 
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+//=============> write your new code here :   /*let newDecimalNumber = 0.5;
+//                                             function convertToPercentage(decimalNumber) {
+//                                               const percentage = `${decimalNumber * 100}%`;
+//                                               return percentage;
+//                                             }
+//                                              console.log(convertToPercentage(newDecimalNumber));  */
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cfe..593f0fb98c 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -1,20 +1,24 @@
 
 // Predict and explain first BEFORE you run any code...
-
+// the function parameter is assigned to constant number the result will be variable error.
 // 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 : variable error.
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
+//syntaxError: Unexpected number 
 
 // =============> explain this error message here
+// the error message is explaining that the parameter is assigned to constant number rather than variable.
 
 // Finally, correct the code to fix the problem
 
-// =============> write your new code here
+// =============> 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 b27511b417..1bce89bf8a 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,6 +1,6 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here : this code didn't declare the  two global variables and the result will be undefined.
 
 function multiply(a, b) {
   console.log(a * b);
@@ -8,7 +8,13 @@ function multiply(a, b) {
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
-
+// =============> write your explanation here : the code have two number variables but they are not declared global in this case the
+//                                              global console.log have undefined value
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> write your new code here  let a = 10;
+//                                           let b = 32;
+//                                            function multiply(a, b) {
+//                                                         (a * b);
+//                                              }
+
+//                                              console.log(`The result of multiplying 10 and 32 is ${(a * b)}`);
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcfd..19499f81fe 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,5 +1,5 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here: the two number variables are not declared and return is not defined.
 
 function sum(a, b) {
   return;
@@ -8,6 +8,13 @@ function sum(a, b) {
 
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here: two number values 10 and 32 are not defined global and the return is not assigned to any
+//                                             return function.
 // Finally, correct the code to fix the problem
-//  =============> write your new code here
+//  =============> write your new code here : let a = 10;
+//                                            let b = 32;
+//                                             function sum(a, b) {
+//                                                   a + b;
+//                                              }
+
+//                                              console.log(`The sum of 10 and 32 is ${a + b}`);
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc35..32be0e14ea 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here: my prediction is that the code will log value of 3 because it have constant variable.
 
 const num = 103;
 
@@ -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 : all the console.log values are 3.
+
 // Explain why the output is the way it is
-// =============> write your explanation here
+// =============> write your explanation here:it is because the global variable is constant number 103.
+
 // Finally, correct the code to fix the problem
-// =============> write your new code here
+// =============> write your new code here :  let firstNum = 42;
+//                                            let secondeNum = 105;
+//                                            let thirdNum = 806;
+
+//                                               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..f29affcc73 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -13,7 +13,12 @@
 // Given someone's weight in kg and height in metres
 // Then when we call this function with the weight and height
 // It should return their Body Mass Index to 1 decimal place
-
+let weight = 70;
+let height = 1.73;
 function calculateBMI(weight, height) {
-    // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+  // return the BMI of someone based off their weight and height
+  const squaringHeight = height * height;
+  const resultBMI = weight / squaringHeight;
+  return Number(resultBMI.toFixed(1));
+}
+console.log(calculateBMI(weight, height));
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad9..a54a8eb8ee 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 upperSnakeCase(inputString) {
+  return inputString.toUpperCase().split(" ").join("_");
+}
+
+console.log(upperSnakeCase("lord of the rings"));
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a703..efb959df46 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}`;
+}
+
+console.log(toPounds("399p"));
+console.log(toPounds("1p"));
+console.log(toPounds("23p"));
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8c..df34ba6d45 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -10,25 +10,25 @@ 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
+// =============> write your answer here : 3 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
+// =============> write your answer here :0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> 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
+// =============> write your answer here: 1 because remainingSeconds of the return value is the last time pad will be called for console.
 
 // 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
+// =============> write your answer here: the return value will be "01" because 61 seconds has 1 second left after converting to minutes.
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b8..5be8b4af2d 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -4,22 +4,50 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(-2);
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${String(hours - 12).padStart(2, "0")}:${minutes}pm`;
+  } else if (hours == 12) {
+    return `12:${minutes}pm`;
+  } else if (hours === 0) {
+    return `12:${minutes}am`;
   }
-  return `${time} am`;
+  return `${String(hours).padStart(2, "0")}:${minutes}am`;
 }
-
-const currentOutput = formatAs12HourClock("08:00");
-const targetOutput = "08:00 am";
+let currentOutput = formatAs12HourClock("00:01");
+let targetOutput = "12:01am";
 console.assert(
   currentOutput === targetOutput,
   `current output: ${currentOutput}, target output: ${targetOutput}`
 );
 
-const currentOutput2 = formatAs12HourClock("23:00");
-const targetOutput2 = "11:00 pm";
+const currentOutput2 = formatAs12HourClock("11:59");
+const targetOutput2 = "11:59am";
 console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+const currentOutput3 = formatAs12HourClock("12:00");
+const targetOutput3 = "12:00pm";
+console.assert(
+  currentOutput3 === targetOutput3,
+  `current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+currentOutput = formatAs12HourClock("00:00");
+targetOutput = "12:00am";
+console.assert(
+  currentOutput === targetOutput,
+  `current output: ${currentOutput}, target output: ${targetOutput}`
+);
+currentOutput = formatAs12HourClock("04:12");
+targetOutput = "04:12am";
+console.assert(
+  currentOutput === targetOutput,
+  `current output: ${currentOutput}, target output: ${targetOutput}`
+);
+currentOutput = formatAs12HourClock("16:12");
+targetOutput = "04:12pm";
+console.assert(
+  currentOutput === targetOutput,
+  `current output: ${currentOutput}, target output: ${targetOutput}`
+);