Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
['d', 'c', 'b', 'a']
['a', 'b', 'c', 'd']
['b', 'c', 'd', 'a']
['a', 'd', 'b', 'c']
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Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.