The test is nothing to fear. If you are in current airline flying then you'll have no issues at all. It's multiple choice and dare I say it, even quite relevant, as is the whole process with Thomson, which cannot be said about a certain "cruise ship group exercise" with a UK major.
Know your Thomson stuff as there's a couple of questions in there about that, and know your aircraft variants inside out. None of it is tough so I wouldn't bother reading your 14 ATPL subjects from cover to cover.