I'm having the exact same problem at College.
I know it has to be done, I can do it, it's just I can't be arsed.
I do Classical Civilisation (Ancient Greece and Rome) and you have to do loads of essays, and I just don't do them.
Then there's Computing, we've just started using Access (BORING!!) so I'm not doing the work there either.
Media studies I enjoy so I'm doing ok there.
And finally Fine Art, doing the worst in that, I like to just get down to it, but you have to do hours of research before you can do the final piece and I'm like 'Screw That' so I don't do it.
I'm well going to fail...