My advice is to just stay in school and study on. Those problems
that you thought are big deals, there are not. You running away
instead of facing them.
If you are studying on your own for 5 subjects, I can tell you that
you will end clueless on what to study. You may say that you will
wake up at 9am and studying till 3pm, just like school normal
routine. You won't. Soon, you will begin to slack or maybe going to
work at fastfood or whatever, then you will be distracted and soon,
you'll get a lousy grade for Os.
However, it is do-able but not advisable.
Seriously, since you are still in school, study harder and f.uck
those problems. Those problems won't kill you anyway. Its better to
have a completed four years secondary school education certificate
and a leaving cert. 