diff --git a/H2 Computing Practical (2021 Syllabus)/CODES/1 SORT ALGORITHMS.py b/H2 Computing Practical (2021 Syllabus)/CODES/1 SORT ALGORITHMS.py
index f2ee9cb..dff400e 100644
--- a/H2 Computing Practical (2021 Syllabus)/CODES/1 SORT ALGORITHMS.py	
+++ b/H2 Computing Practical (2021 Syllabus)/CODES/1 SORT ALGORITHMS.py	
@@ -15,6 +15,22 @@ def bubble_sort(lst):
 result = bubble_sort(result)
 print("Bubble sort:", result)
 
+# optimized bubble sort using last exchange index 
+def optimized_bubble_sort(lst):
+    n = len(lst) - 1
+    while n > 0: 
+        last_exchange_index = 0
+        for i in range(n):
+            if lst[i] > lst[i + 1]:
+                lst[i], lst[i + 1] = lst[i + 1], lst[i]
+                last_exchange_index = i
+        n = last_exchange_index
+    return lst
+
+result = lst.copy()
+result = optimized_bubble_sort(result)
+print("Optimized bubble sort:", result)
+
 def insertion_sort(lst):
     for i in range(1, len(lst)):
         temp = lst[i]
diff --git a/H2 Computing Practical (2021 Syllabus)/CODES/6 FILE OPERATIONS.py b/H2 Computing Practical (2021 Syllabus)/CODES/6 FILE OPERATIONS.py
index 07a9f04..15f5275 100644
--- a/H2 Computing Practical (2021 Syllabus)/CODES/6 FILE OPERATIONS.py	
+++ b/H2 Computing Practical (2021 Syllabus)/CODES/6 FILE OPERATIONS.py	
@@ -1,5 +1,6 @@
 from csv import DictReader
 from random import randint
+import json
 
 header = ["Name", "Age"]
 name = ["Bob", "Tom", "Jerry", "Jesus", "\"Korean, Jesus\"", "Maple", "Lisa", "Jack", "Moby", "Obama"]
@@ -10,6 +11,7 @@
 print("Person:", person)
 print()
 
+# file closes automatically
 with open("TEST DATA.txt", "w") as f: # write file
     f.write(",".join(header))
     for name in person:
@@ -41,3 +43,12 @@
 
 for row in reader:
     print(f"Person: {row['Name']}, Age: {row['Age']}")
+
+# sample code for json files 
+with open("TEST DATA 2.json", "r") as f: 
+    # json.load returns a json object, similar to python dictionary
+    data = json.load(f)
+
+print()
+# method in json library to print json object in readable format
+print(json.dumps(data, indent=2))