If you can, get your hands on a copy of one of your instructor's old exams. It will give you a better idea of his or her style, and you'll probably find that this test, though challenging, will be manageable. It's a great way to ease anxiety.
Does your text book have an online component? My course uses Martini's text book, and I've found the companion website quite helpful. I practice with the interactive tests online before every quiz or exam. The website helps me to recognize key concepts, too, and not get bogged down in detail.
Make a set of flash cards. Your bookstore might even sell small cards on a key ring. Flash through them when you're standing in line or waiting for an appointment. Take advantage of every opportunity to study. Every minute adds up!
Break up your reading and studying into small chunks. I can't read a chapter at a time; it's overwhelming. You need time to internalize all that information. I read four pages at the most, pretty slowly, and I master it in one reading. I only read the chapter once. I'm a tactile learner, so the process of taking notes as I go makes it much easier for me to understand and store information.
Get a study group together. This only works if everyone is equally committed to showing up prepared for meetings. I found that group discussions were very helpful in identifying key concepts to master as opposed to memorizing every bit of information. Understanding relationships and processes is more meaningful in the long run than memorizing bits and pieces. Explaining a concept to a classmate is also a great way to master the material as the rest of the group listens and critiques. Every member of our study group earned an A.
For what it's worth, I had been out of school for more than 20 years when I started A&P, and I was very nervous. So I approached it just as I had my job and did exactly what my instructor suggested; for starters, she says we need to put in two to three hours a week for every hour of lab and lecture time. Yes, that's a lot -- but I never panicked before an exam, and I never had to cram. I also took her up on her offer for one-on-one instruction in the lab. (She's terrific!)
I also went to a "how to study science" session with an adviser and got a lot more out of it than I expected. I followed her advice and now begin every day -- and I mean every day, including Christmas break -- with my "hour of power," always devoted to A&P. I do it before sunrise, as I'm an early riser, and no matter what happens with the rest of my day, I know I've put in at least one quality hour.
Good luck on your test. Take the next day off -- then start studying for the next one!