[{"id": 1, "type": "short_answer", "skill": "equations", "question": "Solve: 3x + 7 = 22", "difficulty": "medium", "explanation": "Subtract 7: 3x=15. Divide by 3: x=5. Check: 3(5)+7=22 ✓", "needs_review": false, "correct_answer": "x = 5"}, {"id": 2, "type": "multiple_choice", "skill": "equations", "options": ["x = 4", "x = 14", "x = 32", "x = 8"], "question": "Solve: 2x = 16", "difficulty": "easy", "explanation": "Divide both sides by 2: x=16/2=8.", "needs_review": false, "correct_answer": "x = 8"}, {"id": 3, "type": "short_answer", "skill": "computation", "question": "Calculate: 16 × 8", "difficulty": "medium", "explanation": "Multiply: 16×8=128", "needs_review": false, "correct_answer": "128"}, {"id": 4, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 5", "difficulty": "medium", "explanation": "Multiply: 6×5=30", "needs_review": false, "correct_answer": "30"}, {"id": 5, "type": "short_answer", "skill": "computation", "question": "Calculate: 6 × 13", "difficulty": "medium", "explanation": "Multiply: 6×13=78", "needs_review": false, "correct_answer": "78"}]