World vs Q&A books

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When studying for the shelf, what is better to do: USMLEWorld questions or the Q&A books such as Lange and PreTest?

Thanks!

my 2 cents

IM - World by far. Kaplan Q book a distant 2nd
Surg - World and Kaplan Q book good. Pretest bad
FM - PreTest and AAFP. No world
Psych - A&L is the best, UW somewhat helpful
Peds - UW is solid, Kaplan Q book as well
 
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