B&W and Secrets

[Taurus]

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So I heard B&W/Secrets + usmleworld will rock Step 2.

If I'm going to study these books anyways, can I use them exclusively to study for shelf exams, ie, B&W/Secrets + question books (MKSAP, pretest)?

Or should I study First Aid for Medicine/Surgery + question books if I want to do well in IM and surgery shelf exams?

Thanks.