Core 2 / Core 1 / STATS 1 - OCR MEI revision notes help

Hi all,
I'm currently revising for my C1, C2, and S1 exams coming up in the next couple of days-weeks and was wondering if anyone had any notes on C2 or S1 for OCR MEI as I really struggle with STATS and have no notes for C2.

Anything would be a massive help to me!
Thank you x