[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=8, width=8", "difficulty": "medium", "explanation": "A=l×w=8×8=64 sq units.", "needs_review": false, "correct_answer": "64"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["32", "64", "32", "16"], "question": "Find the perimeter of a rectangle: length=8, width=8", "difficulty": "medium", "explanation": "P=2(l+w)=2(8+8)=2(16)=32", "needs_review": false, "correct_answer": "32"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 5", "difficulty": "medium", "explanation": "Multiply: 5×5=25", "needs_review": false, "correct_answer": "25"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 12", "difficulty": "medium", "explanation": "Multiply: 8×12=96", "needs_review": false, "correct_answer": "96"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 2", "difficulty": "medium", "explanation": "Multiply: 17×2=34", "needs_review": false, "correct_answer": "34"}]