Math is personalized in American schools. There’s on grade, advanced, gt, and accelerated. Each level above on grade is how many years ahead your class math is. Depending on how large your school is, gt and accelerated math students will take math with the grades above them.
On grade would be quadratic in 9th.
It’s Algebra 2. I just checked and only 6 states require it. Crazy. I was in a state that didn’t require it but finished Calculus 2 at graduation.