Salam
I did A-Level biology last year and MashAllah got A* also got an A* for chem so here r some tips and tricks I used to study for like 6-7 hours because I was doing both subjects AS and A2.
however for notes make an account on getrevising.com
type in that u need notes practise lots of pastpapers have any doubt consult me for the topic material
download the book SNAB AS biology that is really helpful and mostly markschemes contain the words from this book
hope it helped just study books thoroughly look up the specification stick to it
get notes from that site nd start working