Don't drop! I remember for bio 1 i literally got 50s in my first 2 exams. i was about to give up but my brother pushed me. I got a C in the third exam then a B in the fourth one, and i kept my lab a B, and studied really hard for the final and ended up with a B in the class. and also, each exam weighed higher than the one before, so it was a lot of pressure
if you stay on top of your homework (like 100%) and try your very best in lab (even though quizzes were annoying), its very very doable
i realized my studying techniques were way different and off because i didnt know why i was failing 2 exams, so i had to change and once i did, i improved from my third exam onwards, and then i started Bio 2 really well because I knew how to start the semester.
sometimes you have to change your learning style, like from only one time notes, to actually relistening to lecture and rewriting notes/flashcards and all. try and review with a group when you know the material, so you can ask questions and even gain new things
But yea dont let that 55 put you down