You get a book as part of the e-book package that helps you review for the HESIs. It doesn't have many questions, just a really great outline of the important information for various topics as well as boxes of things that almost always come up as test questions.
In every clinical class you take, you have the class final and then the HESI exam on the same day. The exit exam is scheduled after final exams. The grades on the HESI subject exams factor in to your class grade (it was 15% when I was there with the exception of Principles which was 5%) and you don't have to have a minimum score on them, just your overall class grade to continue on. The exit HESI has to be passed with a minimum score or percentage, which is not rounded. So for my class we needed an 87% or a 950. 86.999% still required a retake.
If you don't pass the first exit HESI, you get to review your text and retake it again in 2 weeks. If you don't pass that, you enroll in the senior seminar again and have more chances to retake it. We could take the senior seminar a third time. They told our class that 60% pass the HESI exit exam on the first try. I think our class was inline with that. We did have classmates who had to enroll in the senior seminar the second time but most passed it within the first two tries.
They offer test taking and study sessions led by teachers in the learning center. Go to those. The big thing is to get used to the NCLEX format of questioning early on in the program. Once you crack that code it's a matter of learning to study with an eye for what is a key point and what is nice information to know but not essential. Think big picture rather than small view, forest, not trees (with exceptions that are usually made obvious).
There's a Drexel ACE facebook group that is pretty active about answering questions: Log In | Facebook
for more updated info. I graduated in September 2010 so some things might have changed, but I believe the overall structure is the same.