I definitely second this. I read the book for each semester prior to taking that semester, and it helped dramatically to be able to relate what my professor was saying to something that was a little more plainly worded. Even though you're at the end of your first semester, it may be of help to you to get a better grasp of general concepts - OChem profs seem to love to pull out things on exams that look nothing like what you've already seen, and it's less panic-inducing if you can break them down into things you DO know.
Disclaimer: I absolutely adored OChem, but I got to be very close with the head of the OChem program at the school where I took those courses. She didn't end up being my professor either semester, but just having someone close to me who was enthusiastic about it helped me to be enthusiastic, too. My lab partner was also a fellow weirdo who loved it (and a fellow Organic Chemistry as a Second Language aficionado), which was helpful. There's always some nerd who loves OChem - find them! Then it becomes more of a puzzle and a game, which tends to help you cope with problem-solving when you're confronted with a scary exam.
For what it's worth, OChem seems to be a big weed-out course for pre-vet and pre-med. I started this journey with about a dozen pre-vet friends. I ended up being the only one to actually apply. I lost everyone to OChem, including the daughters of the vet I've been working with (who was heartbroken when they both switched to other career paths!). You do have to pass OChem. Beyond that, you have to understand it, at least well enough to also pass OChem 2 and Biochem. That doesn't mean that you're necessarily going to be stuck in this ego-crushing struggle for another two semesters. Personally, I found OChem 2 to be easier than 1, and Biochem has a logic that's a little more accessible than OChem. Whether or not you get a C in OChem 1 isn't nearly as important as A) you DID pass it, B) you have the guts and determination to keep going even though it's difficult, and C) you take this opportunity to grow from it. College isn't just working hard, but learning to work smart, and that means figuring out how to best prepare yourself for the situation you're facing.
As far as physics goes... I think most vet/med/health science programs kinda expect physics to be bad. If you can take it at a community college, maybe when you're home for the summer or something, that helps. Physics at a university tends to be absolutely awful because it's often associated, at least to some degree, with actual physics majors and/or the engineering departments. Again, don't necessarily let it get you down. I loved Physics 1 but hated Physics 2; a lot of my friends were completely the opposite. There's not that much relation between the two courses, and they're honestly just something you get through because you have to.
Take a deep breath. Maybe change your approach to these classes, if you think that'll help for finals. Khan Academy and YouTube are great resources. There's a site called Master Organic Chemistry that's quite helpful. There are about a million similar sites for Physics because so many people struggle there. Then you can regroup over the break, clear your head a bit, and go back for second semester of these courses with some resources that work for you already ready to go. Grades/GPAs tend to improve in your later years in college, so don't let those worry you too much now. You'll be okay. This is the worst part, seriously.
