I am a big fan of Isaac Physics when I am teaching my own students at school - this massive free set of resources is designed to prepare you for both your A Level Physics exams and also future study at university.
Isaac Physics - The Book
Isaac Physics can really help you achieve a much higher mark in your exams - but it's down to you to do the work and to use all the resources available. Isaac Physics is a massive project aimed at people like you - students studying Physics (and Maths). It's all completely free and if you use it as you work through the course it will give you a massive advantage in the exams.
Isaac Physics - The Website
It's there. It's free. Other students are using this and they are competing against you for the exam grades. What have you got to lose?
Isaac Physics has a little sister who has recently joined us - Isaac Chemistry! Use it yourself (many of you do Chemistry as well) or at the very least tell your Chemistry teachers who at this time may not understand how truly fantastic it can be.