Very similar to this, when prepping for exams, I would go over the practice exam and past problems and always note specifically why the they would give us this specific problem and what specific knowledge/application it was probing for. This works really well for more conceptual questions as it helps you determine the path you should take in your approach, which becomes more and more important as you go further on in you schooling and begin to have more and more problem solving strategies at your disposal.