I'll just keep trying my hardest and if I fail the first exam I'll take a leave of absence so I can decide if I want to keep subjecting myself to this abject misery.
For reference, my school averaged more than 20hrs of lecture and lab each week. That's not including a non-clinical course and a clinical shadowing thing which added ~10hrs. We're middle/middle-high rank depending on the year.
This year I'm doing all of that + I'm working in around 10 hrs of research each week, and planning a wedding.
I have done fairly well.
You will probably survive just fine. It won't be super-easy, but neither is anything else worth having. It is an unfortunate fact of life.
Understand that you probably don't need to memorize everything, but you do need to understand everything. Adjust your strategy if necessary.
If you have multiple choice exams, understand that you essentially DO NOT NEED TO MEMORIZE. You need to recognize, and understand well enough to solve relationships.
Even if your tests are not multiple choice (two of our most memorize intensive classes were not...I won't put down subjects to avoid ID'ing school), you just need to memorize a subset of material for the fill-in-the blank. Once you memorize the subset, it becomes about understanding relationships again.
Good luck. I hope you feel better after your initial examinations.
EDIT: I forgot something important. Don't get bogged down in current material. Just skim over it multiple times, and then memorize things intensively shortly before hand. You'll never successfully memorize everything you need to know. Instead, try to understand it, then memorize the necessary parts later.