Meet with your professors often. If you are assigned advisors, have at least one update meeting per semester with them. I struggle with similar issues and having the face to face time with professors has been invaluable. Definitely don't worry that it will be worse in PT school - I'm not sure how your undergraduate faculty was, but the faculty at my PT school are more supportive and encouraging than any other professors I've ever had! They do everything they can to make sure each student succeeds, and some of mine have even added certain lecturing methods to their classes that I mentioned helped me. Classes are hard and getting behind is stressful, but there's lots of support in place among faculty and even your classmates that you'll do well!
As far as studying for classes, making a schedule and writing it down with set study time blocks throughout the week - and then posting this schedule somewhere I'd see it multiple times a day (I did the fridge door!) - has kept me from procrastinating my studying even when my anxiety gets really bad. I also use different methods to study depending on the class. Those that are difficult to sit and listen to (8 to 5 classes!) I explain the material out loud to myself while reviewing the material. I write down charts to consolidate information heavy lectures because it helps me get all the info right in front of me and I find that it's much easier to focus on a graph than 100 individual slides. If I still struggle I talk things through with classmates or my professors. My professors have even set up phone appointments to talk me through material since I commute and can't stay on campus too late during the week.
Most importantly - MAKE TIME FOR YOURSELF. I have classmates who study at least four hours a day. I know that my anxiety will flare up and my ADHD won't let me focus that long. I always take a "brain break" of an hour of video games the night before exams and it really helps me lower anxiety and focus when I get down to studying. You know yourself best, and you won't do well if you burn out 8 weeks in. Make time to de stress, especially during hectic weeks!
