I am a STEM student at a grammar school ,who would 11+ and secondary school students

I love teaching as I used to teach my brother for his 11+ and it was successful. So I would like to help other children get into a grammar school like me. As that foundation can really help them get to a higher level of education. I am passionate about teaching stem subjects like maths, physics and chemistry also to people in secondary school education too. As now I’m a alevel student studying maths, chemistry and physics, aspiring to be an engineer.