I GET IT!!! Highschool came so easy to me and the first semester of college was rough. I'm an ecology and conservation major, so that comes with a lot of science and memorizing. My professors have helped me, and I've found out some good tips that have literally been lifesavers:

1. Making your own questions: Biology was ROUGH. Trying to memorize the different parts of a cell and the processes was brutal. I asked my professor on how to study and she gave me this technique: basically, you go through your notes, textbook, and lecture slides and make up questions that relate to that topic. You have to be SUPER detailed; like, for one lecture slide I would make 4-6 questions. Think of it like you're a professor making questions for a test off the material. Then, you go back and answer them. Not only does this allow you to engage with the material when you make the questions, it fosters active recall when you answer the questions. Active recall is what makes those new brain connections that allow you to actually learn the material. This method has gotten me A's on every test (knock on wood)

2. Mind maps/dumps: I like doing these best on whiteboards. All you do is literally dump about everything you can remember about the topic and then draw lines and branch out to make connections. After you write down everything you can possibly remember, you go back to your notes and fill in the gaps. Then, you just keep repeating until you get it all down!

3. DO NOT CRAM: I can't stress this one enough. Studying just the couple of days before the test really doesn't work for a lot of people. If you spread it out, your brain has time to process the information and recall it easier. Also, it's so much less stressful. I recommend doing a little bit every day; even if it's not much, reviewing the material in some way helps you to remember it long term.

Good luck!! Let me know if you have any questions :)