Power-points & stuff

I find it really helpful to have powerpoints on what I am revising, but I am struggling to find decent ones. Does anyone have any powerpoints they could email me? I am currently revising for History (American West, Crime & Punishment, and The Changing Role and Status of Women), RE (Religion and Human Experiences), Biology (B2 and B3 foundation), Physics (P3 Foundation), Chemistry (C3 Higher), Geography (Exam 2 Foundation), Maths (Higher , and Numeracy (Higher). It doesn't have to be powerpoints, documents and websites are helpful too!! Anything helpful would be appreciated. THANK YOU!