[{"id": 1, "type": "short_answer", "skill": "area", "question": "Find the area of a rectangle: length=11, width=3", "difficulty": "medium", "explanation": "A=l×w=11×3=33 sq units.", "needs_review": false, "correct_answer": "33"}, {"id": 2, "type": "multiple_choice", "skill": "perimeter", "options": ["44", "14", "33", "28"], "question": "Find the perimeter of a rectangle: length=11, width=3", "difficulty": "medium", "explanation": "P=2(l+w)=2(11+3)=2(14)=28", "needs_review": false, "correct_answer": "28"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 15 × 20", "difficulty": "medium", "explanation": "Multiply: 15×20=300", "needs_review": false, "correct_answer": "300"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 8 × 7", "difficulty": "medium", "explanation": "Multiply: 8×7=56", "needs_review": false, "correct_answer": "56"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 2 × 12", "difficulty": "medium", "explanation": "Multiply: 2×12=24", "needs_review": false, "correct_answer": "24"}, {"id": 6, "type": "short_answer", "skill": "computation", "question": "Calculate: 7 × 5", "difficulty": "medium", "explanation": "Multiply: 7×5=35", "needs_review": false, "correct_answer": "35"}, {"id": 7, "type": "short_answer", "skill": "computation", "question": "Calculate: 5 × 3", "difficulty": "medium", "explanation": "Multiply: 5×3=15", "needs_review": false, "correct_answer": "15"}, {"id": 8, "type": "short_answer", "skill": "computation", "question": "Calculate: 11 × 4", "difficulty": "medium", "explanation": "Multiply: 11×4=44", "needs_review": false, "correct_answer": "44"}]