I don’t understand biology at all and I am worried about how to pass biology . Does anyone have study tips for biology or anyways that can help me relearn everything

Biology is not a hard class however it does require memorization and comprehension of certain topics. I recommend that you read over the chapters and make flashcards and test yourself. You can also ask your teacher for help. There are many videos available that do a great job at explaining each topic in biology. In addition, there are various websites that can also provide information. You should make study groups with your classmates as it is a more fun and effective way of studying.

Firstly, don't stress, you'll get through it. Worrying will just slow you down, and learn Biology as something you get to do, and not a chore.

And if you want to relearn everything from the beginning, then I would recommend  Crash Course's free Biology courses on YT, they also have Chemistry courses and everything. You can also go to Ask a Biologist,   where you can do more than just ask questions.

There are so many more sources of information and everything, but one thing is; don't stress, that's the key.

Good luck, stay safe and healthy.

You'll get through it! Don't worry. If you want me to recommend more websites to you, just comment on this answer :D

"do a testcross with a homozygous recessive plant."

the answer is cell division : )