Do you mean their online test?
They sent three tests to do.
1. Values Fit - You have to rank 20 statements according to what you think you'd like your 'ideal job' to be like/entail. There's really no proper way to prepare for those kinds of tests as there are no wrong or right answers. I guess you can just research the firm's values, which is what I did
2. Emotify - You have to match facial expressions to the correct emotions. There are three exercises in this test. I found the last one the hardest. You have only 3 seconds for the first exercise and 1 minute for the second and third exercise. The third one was harder because you have to read 3 statements and match 3 emotions in one minute. All of them kinda looked the same lol
I think there are some free online tests that resemble
Ashurst's Emotify test. However, I haven't done any.
3. Cognify - This test had 4 parts to it. They were all games based and I found the first one harder. It had some weird graph thing. The rest were fairly easy
Hope this helps

Good luck!