I'll be honest, there isn't much you can prepare for the maths test. Number of things you should bear in mind:
1) You will not be able to finish it, so be as accurate as possible with those you'll be doing.
2) There will be questions that require significantly more time for calculations, so if you think it takes too much time, skip it to other questions.
3) They are just simple "+-x/" calculations, you can practise some primary school maths questions (as they actually are primary level questions, but requiring a lot of calculations to generate an answer)