I'm a 3rd year NYCOM student who has just taken COMLEX and USMLE, so maybe I can offer you some relevant advice:
#1) The best thing you can do between 1st and 2nd year for board prep is to obtain a copy of
First Aid for the USMLE Step 1. Don't buy one yet, because the 2002 edition will be coming out before your boards and will probably be more useful than an older edition. Try to find a 3rd year who would be willing to loan you an old copy. It's only about 250 pages or so and goes over the absolute essentials for the boards. There is also a section dedicated to students taking the COMLEX which mentions some info you should know before taking the exam.
#2) Try to form a rational study plan for the 2nd year. I'm not sure if the "block" curriculum will be carried over for the next year or not, but keep in mind that the NYCOM curriculum has, in the past, been very prohibitive of "extra" studying during the school year thanks to the nonstop exam schedule.
#3) Get a copy of
Microbiology Made Ridiculously Simple. This book should be a required text in all medical schools
#4) Try to learn Biochemistry, especially if you have any plans to take the USMLE. I found the NYCOM course to be weak in preparing students for the boards. I was doing a lot of catch-up studying for Biochem using the Kaplan materials, which were top notch.
#5) Seriously consider taking Kaplan. It's definitely not required in order to do well, but their instructors are phenomenal and I found the books excellent for filling in the gaps in my basic science knowledge.
Hope you find this helpful
Good luck.
P.S. One more thing: as doughboy mentioned, the subjects emphasized heavily on the boards (COMLEX and USMLE) are Pathology, Physiology, Microbiology/Immunology, and Pharmacology. Try to focus your early study efforts on some of these areas, especially Physiology, because it is one of the less "crammable" subjects where you need to understand concepts rather than just regurgitate facts.