Awwww. Don't worry, it'll all be over soon and then you'll look back and wonder why on earth you stressed out about those alevels !
Would you give up your job closer to exams?? Working everyday is probably weighing you down, that's a Lott of hours... I would be exhausted!
If you can, why don't you just work on the weekdays so you can focus on any hw, etc on the weekends? (I don't ever remember studying on weekdays unless it was in class, but I did make sure I completed all my homework on Saturday morning and Sunday evenings) Maybe don't change your work schedule now since were still very early on in the year, but exam periods going to be so hard trying to juggle that job as well as your studies
If not, make SURE you do any catching up during your holidays.
With Biology, (I did ocr too-not new spec coz I just finished my alevels; so we were the last cohort sitting old spec
but teachers say contents pretty much the same), I'll PM you (tomorrow) with any sort of tips/general help becuase I've said some of this stuff on previous threads, don't want to be repeating myself
Try not to stress a lot over alevels, it's really not worth it 😁😕. You will get through this, you'll find what works for you and figure out what's going to get you to pass those exams
Good luck