Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
1500, 2180, 2754, 3600
2180, 1500, 3600, 2754
1500, 2754, 2180, 3600
2754, 2180, 1500, 3600
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.