I would take a look at UCAS' search tool to find out exactly what you need. You may find some universities that only want to see your artistic ability, meaning you don't have to resit a year at all.
If it does come to that, however, I would potentially say dropping Media (although if you do WJEC, you could negotiate with your teacher to do a coursework essay on comic books and then draw a comic book as your production) and English and picking up Art Graphics, Physics and Maths would be most beneficial to you.