Make sure you have a solid understanding of the key topics, as they are more likely to appear on the exam.

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Make sure you have a solid understanding of the key topics, as they're likely to be on the exam.

I always ensure I thoroughly understand the key topics before any exam.

Have you reviewed the key topics to ensure a solid understanding for the exam?

If you don't understand the key topics, you'll likely struggle on the exam.

It is imperative that you possess a comprehensive understanding of the key topics, given their high probability of appearing on the examination.

Make sure you know the main points well, because they'll probably be on the test.

Learn the important topics well, as they'll likely be on the exam.

A thorough and complete comprehension.

The most important or crucial subjects.