Since you're 2010, don't worry about it until later this year. Just do your best to learn all your material in your Step 2 classes and develop a mastery of it. If you learn the material well in the class, it'll get you a good grades (and higher class rank) and make your Step 1 studying easier. Don't be the guy studying neuro pathways for Step 1 when you have a Microbiology test next week.