as i remember they only use 3 or 4 patterns and after each there is a series of different built cubes (only one/none of which can be built from this pattern) with something like a b c d or e none of these. Obviously the colouring in doesn't have to be to exact or to van goghs standards and should only take a couple of mins and then its just a case of rotating it to answer about 6 or so questions. just my two pence worth but those sites look useful!
Anyway don't stress too much if you don't pass first time as I don't believe they make the best assessment of what a controlled needs. So if at first you don't succeed...try again!