Here are a few areas that you can consider. If any of these appeal to you, I can suggest resources...
Have you taken anatomy & physiology already? Is that one of your first-term classes? There are some things that you can do to prepare for that without going overboard. (If you need resources, I can go find my stuff and make a couple suggestions.)
Also, how are your math skills? I had some classmates who struggled with the (relatively simple) conversions/calculations that we had to do in my physiology class. For someone with a science background, they were "gimme" points, but for others, they were a real challenge. There are books that you can take a look at to double-check that your foundation math skills are adequate and even get a jump on some of the drug calculations. (If you want to follow up on this suggestion, I know there are already threads about drug or dosage calculation books so I'll let you google those. There are quite a few opinions on the best book. I like my Pickar Dosage Calculation book, but it sounds like there are others that may be better.)
You can also brush up on medical terminology / medical abbreviations or some basic lab values.
Most of these things are relatively straight-forward memorization that can make it easier to learn/recall the info when you really need it, but won't require tons of context for them to be useful. (There certainly are aspects of A&P that would be difficult to learn without context, and you need to know so much more than just the normal range for a given lab value, but it's a start, and if it will make you feel more relaxed while wait to get started, why not.)