Earlier quoted context omitted.
I was in the "middle" tier math program in high school. But around sophomore year I wanted to get more into science/engineering but you can't switch tiers or catch up to those ahead of you, no matter if you're making extra effort and doing well. It was frustrating. In my case I got a letter about summer school at a local university. So I pre-calced over summer school to get moved into calculus in high school. It hone…
Nice work. However you say you couldn't switch tiers but in the next paragraph you did find a way. So, it sounds like you can.
My school supported me in taking trig as an independent study over the summer (with a textbook and slides from one of the teachers plus a few meetings as needed.) This let me take AP Calc senior year; otherwise I would have missed that opportunity due to being placed in the wrong math class freshman year.