only do art if you absolutely love it, and know you would be prepared to put in tonnes of effort. and still prepare yourself for it to be A LOT of work. i loved art, chose it for GCSE, and dropped it. for me it wasn't so much that it was a lot of work, it was more that you have to hit the assessment objectives: i really didn't know what to do to get an a*. I put in so much work yet was being awarded Bs on my projects. i didn't know how to achieve top marks. Art gcse killed art for me, there was no freedom.
if i were you i would either simply not take art and take one fewer gcse, so it's easier to acheive top grades, (remember it's quality not quantity), or take ancient greek instead. it is so interesting and really stimulating, and helps you will analysis of literature and improves the way you think. i loved it. it's also highly regarded by unis, because it's very academic. don't miss what could be your only chance to study it!
Don't do arrrt! I hated it and wish i hadn't have done it, it's also like 98% for an a*...