Free resources for GCSE Subjects Watch
Although some of the exam boards of the resources may not be applicable to you, you can incorporate the relevant information into your own materials/resources like I tend to do as having various resources phrase aspects differently can broaden your understanding overall.
I also have lists of YouTube channels and websites that are available for each subject which have been a great help with my revision too.
English Literature - AQA
and edexcel maths please.