Yes, I have done this test. They have a specific order checklist of three things that need to happen for the train to depart. Then they mix them up and you have to determine if the train can depart.
I remember they play a tape, where there is a horn, and someone saying :Train ready to depart!"
You can ony dispatch the train if the sounds are in a specific order.
Make sure you listen to the instructions well. Then, ask any questions if you are unsure.
I wouldn't necessarily describe it as easy, the second part where you're both listening for the right sound sequence and answering questions can be a bit head scratching at first, and quite a few people do fail it (which if nothing else demonstrates why dispatchers arent actually allowed to do what this test simulates, which is to dispatch trains and talk to the public simultaneously). I'm not trying to make you worry, it's a straightforward enough test, but some people will find it challenging.