That book is great! I loved it.
The questions you find in that book are much much more harder than what you would find on the USMLE. I really suggest you use that book for your Step 1 and Step 2 studies.
I highly suggest you get that book, it is really helpfull when going through the robbins text book
I had second addition, but i think its best to get the latest one.
Premed[x] Basic Sciences [x] Step 1 [x] Step 2 CK [x] Step 2 CS [x] Step 3 [x]