I very much love using the Board Review Series... and I am really curious to find out what other students think about it. Which books do you think are useful, and which are not (that useful)?
Physiology and behavioral science are the only ones people seem to really recommend for step I. Path used to be the gold standard but rapid review path is now the go to path resource. The rest of the subjects might be ok for coursework but there are better resources out there for boards.