Year 12 examsWatch
Well 6 weeks is still plenty of time to go over all the content and prepare.
As esraaf said watch summary videos to cover the content.
What you need to do is make a plan for the next 3 1/2 - 4 weeks on how you will utilise your time to go over all the content. Then spend the last 2 weeks focusing fully on practice questions to hone in on your exam technique.
For maths however only spend 2 or so weeks recapping the content and spend most of your time doing practice as that is the main way to improve your understanding and ability.