Okay real talk....

I have exams on monday (in 2days) and the teachers have me giving us work overload therefore nobody got to study a few days ahead so I’m starting today (Saturday). Ive always struggled in bio and havent got good grades in bio. This exam will be the exam to decide if i pass or not and its so stressful because ive been studying since 11am till 5:00pm now and I HAVE LEARNT NOTHING. I feel like i haven’t learned a single thing... I feel like giving up to be honest but it will disappoint others so I dont know what to do with myself or this stupid exam. (Keep in mind this is my first exams ive taken since Ive been doing online school for 16 years). I’m fucked and need advice before I go crazy!!!!!!!