It’s hard to study for PT school before it starts, mostly because you don’t know what you’ll be learning first and you have no idea what the professors want you to know.
However, if you really want to start learning, you could buy an anatomy book and look over basic parts of each bone and where the muscles are in relationship to each other. I knew that I wanted to buy a Netter’s book before I started school because the photos are beautiful, and I know that it would be helpful at any school. You can contact upperclassmen or your anatomy professor to get your future booklist, if you want other great book options.
Don’t try to study specific muscle attachments. Each professor will teach you differently, so it’s better to not learn them incorrectly. Learning generally where muscles attach or where blood vessels are located would be helpful, though.
As for physiology, you can watch KhanAcademy videos to get a refresher. They have awesome videos, and I actually watched them often during several different courses.
Instead of studying, I recommend that you have as much fun as possible. Go on vacations, spend time with family and friends, read books, save some money, decorate your bedroom, or exercise.
You were accepted into your program because the faculty believes that you will be successful in the program. I understand any nerves that you have because we’ve all been there. Just remember that everyone has been in your spot before, and you will have plenty of help and resources when you begin school.
It’s ok to study, and it’s ok to not study. You don’t need to worry either way.