In the 'How to get a 50 in Bio' thread, this appears towards the end of the post:
"My scores on practice exams: for unit 3 i started around 45/75 on the end of the summer holidays (do not start prac exams there lol) and ended up around a 71 - 72 average on papers by the end of Unit 3. For Unit 4 i started around 60/75 just before term 3 holidays and worked my way to around a 73 average by the end."
I'd say that if you're doing approximately as well as OP did, and you do consistent practice and revision you could make your way up to the high scores on OP's papers and potentially get yourself a fantastic SS!
I can't give any advice of my own as I'm not up to practice papers myself for bio yet, but I can tell that I have some great competition if you're doing them this early haha
