OMG I'm in exactly the same boat! Ok yes practice writing to time - instead of just going spaz and writing illegibly, actually take care to make sure while you're writing, that the examiner can read your writing. It's as simple as that. Think like the examiner. If they can't read it, then cross it out. If you practice with this caution, then you'll get better. I also found that writing with a thicker pen (as in thicker tip) is very helpful. Especially a black one. My teachers can read my writing a lot better now. But its all about practice.