I've not taken it, but I took the straight up "no driving school driving test". It's not hard, but you have to get 90% or above. They have all tests in many langauges (English benig one of course) so that's a plus. The minus is, they are very much Engrish. Throw in them trying to be sly, and it can be tricky. I literally had 4 negatives in ONE short sentence.
My friend took the 50CC test twice (two days consecutively) and passed the second time. He said the hardest part is the Engrish. Just study the books (they sell study materials in English too) and you should be fine.