They can't kick you out, oh hell no, you're in the middle of year 13, and you have summer exams yet to be completed... why would they kick you out? If anything, they'll lecture you on how poorly you did in Eco and Bio to give you an extra boost so that when it comes to the real exam, you revise well for it, and don't flop it. Don't stress. I have parents evening this week on Thursday and I'm absolutely sh*ting myself as I got grades BCC, which is waaay below my target. I know I'm also going to get told off for my poor attendance (yeah, it's poor because I take days off sixthform to privately study at home!)