[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=8, width=7", "difficulty": "medium", "explanation": "A=l×w=8×7=56 sq units.", "needs_review": false, "correct_answer": "56"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["32", "30", "56", "15"], "question": "Find the perimeter of a rectangle: length=8, width=7", "difficulty": "medium", "explanation": "P=2(l+w)=2(8+7)=2(15)=30", "needs_review": false, "correct_answer": "30"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 12 × 5", "difficulty": "medium", "explanation": "Multiply: 12×5=60", "needs_review": false, "correct_answer": "60"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 2", "difficulty": "medium", "explanation": "Multiply: 17×2=34", "needs_review": false, "correct_answer": "34"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 11", "difficulty": "medium", "explanation": "Multiply: 3×11=33", "needs_review": false, "correct_answer": "33"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 10 × 15", "difficulty": "medium", "explanation": "Multiply: 10×15=150", "needs_review": false, "correct_answer": "150"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 17 × 14", "difficulty": "medium", "explanation": "Multiply: 17×14=238", "needs_review": false, "correct_answer": "238"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 3 × 6", "difficulty": "medium", "explanation": "Multiply: 3×6=18", "needs_review": false, "correct_answer": "18"}]