Maths tests are very very simple - based on calculating costs of purchases and converting £ into Euros/vice versa. You are given a price list, a calculator, a pen and some paper.
English tests are trickier as it's a case of picking the best answer available (but I sometimes felt none of them were correct). You are given a short paragraph then asked whether 4 or 5 statements are correct, false or whether there is insufficient knowledge in the paragraph to decide.
Sure there must be similar things you can buy or find on the internet. I must admit I didn't do any preparation at all for them and passed - but that English test does seem to catch people out so might be worth practicing.