Apprehensive times. It's understandable you feel this way, that is a lot of **** to go through in a year.
It is February, there are a good few months till exams, you have enough time, more than enough, make it a total priority over everything bar mandatory things. Last year was a total write off, nothing you can do now, your Dad seems a toxic person unfortunately. You're going to Uni this year right? Focus on that, you'll be well away from your family problems there, you can do it. Not much anyone can say about your family without being unrealistic/uninformed/insensitive. But it does totally dysfunctional. Not only A Levels, but also prioritise your own happiness from now. Do things you used to enjoy or try something new, anything, something to give you a sense of achievement and build your motivation/confidence again.