Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
1s2 2s2 2p6 3s2 3p6 3d4 4s2
1s2 2s2 2p6 3s2 3p6 3d5 4s1
1s2 2s2 2p6 3s2 3p6 3d3 4s2
1s2 2s2 2p6 3s2 3p6 3d6 4s1
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Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.