I just happen to be an ITLS instructor. My advice for you is pretty consistant with what the others have said, read your book prior to the beginning of class. At the basic level; long bone splinting, spinal immobilization, ked (xp1) application and use, patient assessment, helmet removal, are a few things that I can remember for basic level. My other bit of advice is to get an detailed, systematic approach to patient assessment, don't work on C if you don't have A or B done. As for scenarios, there are 3 different types; military, hospital, and pre-hospital. Another bit of advice, our classes are "hands on", if you don't palpate the area, your evaluator may not tell you if you have missed something. So, study, do your best, and you will learn.