Is redoing coursework really worth it?

Overall in my AS I received a C in ART...
What annoyed me was that I actually got an A in the exam but a D in the coursework.

As many of you artists know, Art Coursework is 60% of the final mark as well as being the toughest and most work.

I have a week to decide whether to decide if I should retake my coursework, on top of this years coursework... I could still aim for at least an A this year but I would need to bag almost full marks

Any Advice?!

*Please note I am very lazy and full of regret...*