Any really good education apps or websites?

Hi, so I'm going to start getting into more advance work at my school (Year/Grade 9) and I've struggled a bit because I can't grasp concept properly in Maths and such. I looked around and looked at some other answers, but they only suggest pretty basic apps or websites that don't really help anymore. So, if anyone could please help me out with this and give me a good tutoring or just website or app that I could use to help me and to advance me more I'd be very appreciative. Thanks (: