Getting an A at higher chemistry

I got a B at Nat 5, however I'm determined to get an A at higher. I'm already studying like 5 hours a week or something, and in my defence I would've done better if I'd had a better teacher last year. I have the same one this year, but I think I sort of understand his teaching method now. He doesn't think I can get an A though, and he gave me some statistics about how 3% of people that got a B at Nat 5 got an A at higher. Could anyone who managed to do this previously please give me some tips so I can get the grades I need?

Hi,
I got An A in Higher Chemistry (retook it tho). and a B at Nat 5
Firstly do past papers, all the way back to the 90's.
It may feel like a chore but its worth it.
I used the Jab Chem traffic lights for higher chemistry, to help me learn up all the info. and to make sure i'd consolidated my knowledge.
Theres some good flashcards on quizlet for each subunit; so i'd make good use of them.
Best of Luck