Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
Smash is played softly; topspin is hard.
Smash is performed primarily from below; topspin is from above.
Smash is used for aggressive play; topspin is controlled.
Smash is less powerful than topspin.
Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.