I've got that tomorrow as well, and I write in basic.
Knowing lots about electonics (I got 98% in my mock), I always try to write code as complexly as I can (with comments, of course).
I recomment basic as it is so versitile, but if you have been taught flowcharts, use them.
You can still get good marks for the code writing section by using no complex features - loops and things aren't needed, you can get a good mark with:
Code:
high 1
wait 1
low 1
wait 1
high 1
wait 1
low 1
wait 1
high 1
wait 1
low 1
wait 1
instead of using a loop.
Good luck,
Andrew