NBME 3,4,6, or 7?

[Orthodoc2be]

I'm planning on taking a total of 2 NBME exams before the real deal. Which two do you think would be the best for me to take? I'm thinking of doing 6 and 7 since I've heard they're supposed to be pretty good at predicting your actual score, but I wanted some other opinions.

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[winkleweizen]

6 and 7 fo sho...why not 11 and 12? Bootleg copies?

 

[ArcGurren]

6, 7, 11, and 12. Don't bother with anything older

 

[dangit]

what about 5?

 

[iA-MD2013]

6, 7, 11, and 12. Don't bother with anything older

I was going to do the really old ones just because I'm worried there will be repeat questions...bad idea?