You move forward. What happened already happened.
All you can do is take care of your health.
Do the best you can from here on.
See what happens in 3 years.
If my own kid has a bad year in HS, I would not have them repeat the year but do a realistic evaluation of future career plan.
But last thing you want to start doing is blaming teachers and make accusations that are just not plausible.
Just move forward. Life is not linear.