That's it- I take it there's a little booklet that has all the answers in it and you just have to remember them, I did it quickly this morning and got 10/24 in 4 minutes and quite honestly don't know whic ones I got right and which ones I got wrong they were so obscure and for the most part irrelevant.
Edit: Actually, is that really the official practice test thing? Surely it should be in a .gov.uk domain?