GCSE Statistics Higher Edexcel help

I'm doing Edexcel GCSE statistics and I'm finding it pretty difficult. I'm working at a strong grade 9 in maths currently and would like to try get at least an 8 in Statistics as well. Any recommendations to how I can reach this grade?

Why are you taking it as well as Mahs?
Try these: https://www.drfrost.org/courses.php?coid=10874

My teacher put me up for it and said it was an extra GCSE