Q book Use - straightshooter

[ArchivalUser]

How is the Q book for Step 2 CK to be used?
One would do Medicine and then go through relevant questions in Q book, right?

Apart from the six books (IM, Surg, ObGyn, Peds, Psych and Q book) are there any other Kaplan books to be used for Step 2 CK?

Thanks in advance