11 Plus,11+, SATS, Maths in general for those below year 9

I am a student in year 11 in a Grammar School and have completed my GCSEs this year. I am great at maths and even did FSMQ (Free Standing Maths Qualification) in my GCSEs which is normally undertaken in year 12. I am taking take Maths ,Further Maths, Economics, Physics and History for A Levels. I have tutored 11+ (entry examinations for grammar schools) before and am willing to offer SATs, 11+, or any other primary school students. I may also be able to teach maths and science to those in year 9 and below.