Want to drop out of year 12 and do alevels at home alone

I started this sixth-form in September and I do history psychology and economics. I can’t function in a school environment because I have ADHD so I personally can’t learn anything in a classroom. I don’t enjoy anything about it and it’s too much stress, I have to force myself to get up every morning and my attendance is 80% and was 70% at the start of the year.

It has made me so depressed and I feel like I could teach myself better at home and have motivation to do other things again. Is it possible for me to pay to sit my AS exams in June at an exam centre and just study myself until then? I will also get a part time job