courses for 16 years old

Hi, I hope whoever is reading this, they are well and would help me as much as they can!
I will be going to sixth form after summer holidays. I really enjoy maths so I will be taking A level maths. I would like to do any part time courses related to teaching or any other skill that will be helpful for me but I cannot find it. can anyone please tell me where can I do part time course that is short and is free or is cheap?
I was thinking if I did teaching course, I could try teach maths to students (tuition) as I really enjoy maths.
I found level 1 teaching course in college that was part time and 8 weeks long but I cannot do it because it is for 19+, I would really like to do that course. They said that I can do full time courses that are for 16-18 years old but I will go to sixth form so I cannot do them. can you please provide me any advice on which course can I do at 16 (that will benefit me for example I can get a job with that course) that are part time and short and where can I find them?
I am really desperate to do a part time course, I hope anyone will advice me and help me.
I would really appreciate your help.
Thank you,