Can I ask what your reasons are for pursuing a biology degree? I think having a focus and interest in biology is key to thriving in the 'weed-out' classes. I won't lie, it is a difficult degree and my mental health has taken a hit throughout my years especially watching other majors having a social life, lol. I have a great support system and great passion for biology, specifically animal sciences, and that's what kept me going.
I started as pre-vet but quickly realized it wasn't the right track for me and neither was pre-med so I started looking to grad schools. Sometimes I have the regret that I didn't do business or nursing because of the salary and job security but nonetheless I love my coursework, the people I work with and the research cause. The best advice I can give is make sure you find something your passionate about, learn how to write stellar notes (I always recommend hand writing flash cards as opposed to Quizlet), dedicate yourself to studying and you will be golden. Biology is however one of those degrees that you will likely need a grad degree of some sort or certification to make it beyond research tech or research assistant!
Good luck!