Just like you,your british pen-friend is learning school and doing to college this year.write a letter in which ask him/here: what he should do to go to college.what career he has chosen.what he is doing to to realize his plans.what you should do to get to university in your country.
I am writing to ask you about your college enrollment process. Had you already passed all the exams? Does your college have any specific or unique requirements for new students? Also, I know you are very good at math, but you have never told in which specialization you are interested in. Did you choose finance or another field of economics? I think to choose a career is a very difficult decision, and I hope you have a well-prepared plan to follow.
For example, in my country to enroll for a university programme you have to pass school's exams which are obligatory for everyone and also write some kind of tests in university to prove your knowledge.
Anyway, I hope you are doing well.
Best regards,
Ivan