diff --git a/ref-test/app/tools/data.py b/ref-test/app/tools/data.py
index d72c60f..8702741 100644
--- a/ref-test/app/tools/data.py
+++ b/ref-test/app/tools/data.py
@@ -19,6 +19,39 @@ def validate_json(file):
     file.stream.seek(0)
     data = json.loads(file.read())
     if not isinstance(data, list): return False
+    for block in data:
+        block_type = block.pop('type', None)
+        if block_type not in ['block', 'question']: return False
+        if block_type == 'question':
+            if not all (key in block for key in ['q_no', 'text', 'options', 'correct', 'q_type', 'tags']): return False
+            if not isinstance(block['q_no'], int): return False
+            if not isinstance(block['text'], str): return False
+            if not isinstance(block['options'], list): return False
+            for option in block['options']:
+                if not isinstance(option, str): return False
+            if not isinstance(block['correct'], int): return False
+            if not isinstance(block['q_type'], str): return False
+            if block['q_type'] not in ['Multiple Choice', 'Yes/No', 'List']: return False
+            if not isinstance(block['tags'], list): return False
+            for tag in block['tags']:
+                if not isinstance(tag, str): return False
+        if block_type == 'block':
+            if not all (key in block for key in ['question_header', 'questions']): return False
+            if not isinstance(block['question_header'], str): return False
+            if not isinstance(block['questions'], list): return False
+            for question in block['questions']:
+                if not all (key in question for key in ['q_no', 'text', 'options', 'correct', 'q_type', 'tags']): return False
+                if not isinstance(question['text'], str): return False
+                if not isinstance(question['q_no'], int): return False
+                if not isinstance(question['options'], list): return False
+                for option in question['options']:
+                    if not isinstance(option, str): return False
+                if not isinstance(question['correct'], int): return False
+                if not isinstance(question['q_type'], str): return False
+                if question['q_type'] not in ['Multiple Choice', 'Yes/No', 'List']: return False
+                if not isinstance(question['tags'], list): return False
+                for tag in question['tags']:
+                    if not isinstance(tag, str): return False
     return True
 
 def randomise_list(list:list):