Struggling with iGCSE (Edexcel) Chemistry

Hi there.

I desperately want to achieve all A*s in my GCSEs, but I'm finding Chemistry iGCSE particularly challenging.

I listen in class, I read my textbook and I ask the teacher if I'm stuck - but it just doesn't seem to stick or 'click.'

Does anyone have any great tips for revising, for improving at it or any great revision books?

Thanks a lot.