Don't worry about it - really easy, commonsense test. It's multiple choice and the test can either be taken at a local college for about £40 or £50 - can't quite remember how much. Or in your own home for £10 more. Contact the NPTC for providers or get in touch with your local agri college, if you have one.
Take a look at the link at the bottom of this post. If you read through all the info, it will help you with the test. You need to do a separate one for each species you want to transport, but they are all basically the same - the thing to remember when answering each of the questions is that health, welfare, and safety of the livestock is the key to it all.
There was one stupid question like, "You're delivering pigs, and one falls sick. Do you a) ring the police, b) ring the nearest vet, or c) ring the destination and tell them you're going to be late".