it's a bit concerning that you haven't done any gcses. yeah, they might not be as important as a-levels but they're what you need to do some a-levels, and helps build up a good work ethic. unlikely a sixth form will take you in if you need to do maths and english and you never bothered turning up to the exams. you need a decent work ethic- if i were you i'd pull my socks up and go to the rest of the gcses you have left.