dude... calm down. step 2 ck is not the same KY-deficient rectal exam as step 1... if you've been doing well on the shelf exams, and have been refreshing your learning from earlier clerkships you'll do ok.
step 2, imho, is more about the practical application of basic science principles to patient presentation (step 1 - do you know it?, step 2 - do you know how it will appear clinically?, step 3 - can you manage it?).... being from rockford, you've got a bonus year of clinical experience.
stop freaking out.
-t,md
ps - i recommend knowing your IM cold... like everything NBME, this exam is heavily medicine (and the IM principles can help you pull responses out of your @$$.)