USMLE Step 1
Physiology

Many of the questions are in a graphic or diagram format. That
requires that you not only have the information, but also are able
to process it quickly. Practicing good quality test questions will help.

BRS Physiology is focused and relatively short. Although it is
very useful, don't expect to have all the answers in there. I also
read
NMS Physiology for a more comprehensive review.

Even if the review materials are not as good as in other subjects,
physiology questions were manageable. There is also a certain
degree of overlap with pathology and pharmacology.