Question resources available for Behavioral.

Ethics:

There are 2 main books for ethics Fisher's and Khan's. Each one of them contains almost 100 high yield questions. So I think Fisher's is a good start, and if you still not confident after finishing it you should give Khan's a try.

Biostatistics:

UWorld has a dedicated bank for Biostatistics for which they require 35$, Those questions are super HY and A++. You must do them and understand not just memorize the way equations are done. The real deal will mutilate the shape severely, that feels terrible huuh!! you bit! It would feel even worse if you're not prepared for this in the pro-metric center, but what the real exams won't do is change the concepts. The same concepts you'll encounter here will be the same in the exam you just have to recognize them and not be thrown away by any new presentation you're giving. That could only be achieved by understanding rather than memorizing. Overall most students reported that those questions were adequate for the step exam.

Behavioral:

There is what is good and what is almost damaging, and those are BRS and Pretest respectively. I've said previously that BRS contains 700 of A+ type of questions, while they are almost exclusively one step thinking, they get the right presentation of the case presented to you clearly. Pretest, at least the copy I've navigated through in the book store and from my peers, really concentrates on obscure details, those that almost no one reported being asked about in the exam, and ignores an enormous amount of other High Yield materials. depending on Pretest would hurt your score rather than help it. My advice do NOT even buy it.

Comprehensive Question Books:   

There are 3 major books and all of them got really good and high yield questions when it comes to behavioral. They are Kaplan, Rx and lange. I intend to do them and I think you also should do the same.