Update:
Day 3: Did a bit more of learning biology and did past paper questions for the 30% course I have covered from 7 of the 9 past papers in the old specification getting above the A grade percentage marks needed, leaving the last 2 papers for nearer the exam and then got sick of biology so did some chemistry revision, doing part of module 3(unit 2 in old spec) and doing past paper questions just for those topics from 3 past papers. Biology is the longest thing ever but the grade boundaries are low and managing to get As for 30% of course after just spending 10 hours without it being covered in class shows that anyone can do it.
Maths: 10/100 hours
Biology: 15.5/100 hours
Chemistry 2.5/100 hours
Physics 0/100 hours