You sound pretty satisfied with yourself. If certain prereqs had to be met to get into those courses, somebody (not you) already thought about the scheduling. It doesn’t sound so much like you’re paving the way; it sounds like you’re taking advantage of opportunities your counselors have provided to your student body. If you had to meet the prereqs to get into those courses, so did your friend. He’s there because he did the work, not you.
It sounds like some academics come easier to you than your friend. You may want to think about developing some humbleness about that because college is going to be a different world. No matter how smart you think you are, there’s going to be someone smarter. And you’re going to be competing with them for a spot at whatever college you want to attend. You should focus your energy on compiling your own resume and leave your friend alone to take care of his.
This decision is on your school’s guidance counselor. Your friend’s approval for these courses probably has very little to do with you and everything to do with your school’s administration. I’m with @skieurope on this question, I don’t think that loading up on AP courses in sophomore year is good for anybody. Also, you might well have gotten an A instead of a B in Calc AB had you taken it as a sophomore rather than a freshman.
I also wouldn’t assume that your friend isn’t going to do the extra work based on previous behavior. It may be that he has found a new source of motivation for his studies and will apply himself differently in the future. Only time will tell.
What you need to think about is what kind of boundaries you want to set with your friend. Do you want to be collaborative and study together? Or do you want to be competitive and limit how much you are going to participate in his learning? Either choice is valid and either will impact your friendship in some way.
Do try to avoid “I told you so” if your friend fares poorly. And be sure to congratulate him if he does better than you.
@skieurope I don’t think I was improperly accelerated, almost everyone else is a senior and I got the second highest grade in the class (only one A, historic avg in class below C, but most kids who get Cs in his class get easy As in college). AP Exam was way easier than the tests he gives us (95% pass rate in his class). His grading is so pedantic that simple addition at the start of a proof was the difference between a 94 and an 83 on my last test.
I seem like I’m being cocky here but IRL I’m just…not.
I’ve only warned him once, at this point I will just leave him be.