Need exam help! What shall I do? (details inside)

Ok, as some of you may know I broke my ankle pretty seriously recently. I have had to miss 4 weeks of school and my exams are quite close, I’ve got three of them in May. I’m very stressed and worried as I’ve missed a lot of the revision sessions as well as course work. I don’t know what to do as I have to catch up on a hell of a lot of work and revise for the exams.
As if this wasn’t enough, my parents, most noticeably my dad, is only making it worse for me by pressurising me. He’s a bit of what I would call a pessimist and he’s always throwing remarks at me like “You’re going to flunk now…” or “You might as well forget the A…”.
This is very unmotivating and I am finding it harder and harder to cope with all this and his demotivating remarks. Mum just worries and isn’t much help as she isn’t the kind of person I can take refuge in. I have tried to keep up with the course work but it’s just too much. I had to rest after the operation on my ankle.
I don’t know what to do and am feeling very stressed right now. Any help would be much appreciated. Thank you : )