Failing biology A-level

I am 4 months away from my A-level exams and I have just received a U in my last biology mock. This came as a shock to me because I spent around 2 months revising for this exam, where in the 3 weeks before the exam I would revise 3 hours a day on average (for biology alone). I don't understand what I did wrong. I went over all the content and did exam practice. My parents have told me that 3 hours a dah is not enough and that I should increase how much I revise significantly. How many hours should I revise a day for OCR biology and what are some revision techniques which may aid me? I would apprectiagte any pieces of advice.

How are you revising when you are not doing exam practise? It's all well and good spending loads of time revising, but you need to focus on the quality of your revision and you need to make sure you are eating and sleeping properly.

I am doing biology A level too (AQA not OCR but I sure it isn’t too different) what kind of methods are you using to revise? Personally I make flashcards as a lot of AQAs biology content is just fact recall and in exams it makes it a lot easier when answering questions when I know the content off by heart if that makes sense.

Honestly, I just make loads of notes. I spend a lot of time on uplearn too. I think maybe the fact that I am too intimidated to do exam questions may be hindering me.