It sounds like your high school really dropped the ball on this one. At my kids high school all kids are automatically enrolled in the 5 basics (English, math, history, science and foreign language). The levels vary of course from student to student but everyone has to take all five for your freshman and sophomore years. I can’t fathom how a high school could let this happen to a student who was potentially targeting top colleges.
I hope you weren’t doing something like ignoring standard scheduling advice and doubling up on math and science instead. I’ve read many posts on this site, typically written by children of immigrants, who misunderstand how college admissions works and take this route thinking it will help them, but it ends up causing problems instead. If this is what happened its too bad no one stepped in to correct it sooner.
You’ve been giving some good advice on how to try to overcome this. Good luck. I hope something here works for you.