I can’t speak for Psychology
But for Bio (the old study design at least ) - you can certainly do very very well without the 1/2.
I would suggest learning your organelles - and (if u can find the textbook) start working through the first few chapters. The old edrolo one had a couple of revision ones as well - which helped a lot for me last year. If you can get through
membranes and maybe the start of transcription/translation - you should be set.
But as with anything - it will require a lot effort.
Bio was particularly painful because it had sooo much content to memorise. I used Anki flashcards (a bit like quizlet) at the start of the year - which helped.
Anyway. Good luck!