You’ll be a young HS graduate: Just trying to think outside the box for after senior year and before college, so that you have some time dedicated to math while maturing a bit if your parents worry about sending you to a far-away college. (When you’re abroad, you’re under HS rules and live with a family so you’re not 24/7 unsupervised.)
Here are some examples
- starting p.7 http://cache.media.education.gouv.fr/file/special_1_MEN_ESR/42/4/MP-mathematiques_287424.pdf (This class has 12 hours of math a week)
- IIT JEE on Khan: https://www.khanacademy.org/test-prep/iit-jee-subject/iit-jee