learning chemistry & physics& lots of maths to A* at A2 (advice?)

As with maths the general strategy is to go through the theory in aid with questions and then do questions, as many as you can find and many more.

Since I will likely be living and breathing A levels as I have for the past week, my question now stands : "How do you best learn chemistry/physics for a guaranteed A* at A-level?"
Please note this is not a question about memory; which method is better to
Considering many methods :
doing questions
reading theory
visualizing theory
flash cards
summarizing
(no I'm not saying teaching others)
specification aimed theory
past papers spam (I'm doing the new spec so I have none)
Writing out to be learnt information
any other method that was found excellent?



Goals:
I write neatly
I write adequate answers
I absolutely answer every question within less than the recommended time.
I make no errors
I recall the right answer to the right question
Finally I receive an A* in the A-level subjects

What exactly should be the procedure: tips, hints?
(remember I will be pretty much studying all day everyday)

Again back to maths now, I have realized that at times I may learn a specific formula(this is an example for maths) and without any problems I am able to complete all questions without any issues using it and remember x for example
other times this same thing happens except I manage to get stuck in multiple ways (irrelevant of difficulty) and end up fixing it myself after time. Is there any advice for maths to avoid a pitfall like that?