Relax!, you'll do fine.
Check this website out:
http://www.pharmacyboardreview.com/index.html
Dr. Cutie, one of the professors at LIU, holds reviews and gives out material to study for the compounding exam (and all other board exams). You can perhaps sign up for the hands on experience part that the compounding exam requires you to do and that's 60 points of your grade (out of 100). It's really nothing crazy hard where you won't be able to do it after getting a feel for what it's like to compound during one of his reviews. Other than that, day 1 is 40 points and it's basic stuff like patient profiles, look alike/sound alike, and errors and omissions. Once again, if you go to one of his reviews you'll get a feel for that as well and that's just general stuff even if you don't. However, I'd highly suggest experiencing what it's like to compound in those labs because personally speaking..day 2 which is the hands on day - it's easier than day 1 (the written, 40 pts portion). Day 1 is all random and either you know the stuff they throw at you or you don't. Day 2 however is a different story and all practice. Dr. Cutie's review will be more than sufficient for that. Good luck..don't panic and you'll do just fine. Make sure you know your math down pat for day 2 or else you won't be compounding correctly. Key though is to be confident and not panic!