Suggestions ?

I came here last year from Iran and based on the school decision and a 40 question placement test which I didn’t know anything about and I had to add that iran’s math curriculum is different I ended up in math 3 (algebra 2) but it was too easy and math was my favorite topic and i got frustrated because I’m a sophomore and the class is full of students that are bad at math so I took precalc in community college(I got A in the class) and when I try to convince the school that I deserved to be given a chance and I have done everything I could to show I was eligible and school didn’t let me all I have gotten from school is that I don’t care you are an immigrant, I don’t care we didn’t tell you about the test, I don’t care your native language is something else. P.S I also tried to change my class after a month and my math teacher approved me but the school rejected.