Been there, done that...

Call me masochistic, but I actually enjoyed doing my English exams, especially for GCSE and my A Levels (second attempt), as well as my Media Studies A Level. Basically, it was because I knew the material (we were allowed two A4 sides of notes into one of the Media Studies level, and if you wrote small, those notes could be pretty comprehensive! ) I have a flair for English, so most of the papers were easy for me.

So the advice I can give is know your material, and get lots of sleep the night before. And above all, good luck! :P