Hi SW1,
It's just a personality assessment test. Essentially, the test has 21 "questions". You'll have 30 minutes to complete it. It's a computer-based test.
In each "question", you will get a list of 8-10 phrases (I can't recall now), and you have to rank them according to which phrase most describes you as #1 and the rest in descending order. Some phrases are reused in other questions as well.