Did it about a month ago.  Fairly simple, no real way to prep for it.

Just gives an indication of likelyhood of doing well in the business but we all know you have to take that at face value and thats it.

Alot of decision-making questions (if you were trying to do this, which would be the best option?  etc…) and aptitude questions.

Try not to answer what you think they want to hear, just be honest because there are alot of redundant and repeating questions but in a different format.  That could trick you and cause some inconsistency.   I did mine as a simple formality as I have been in the business for over 11 years, just making a move from a team to going on my own at a new firm therefore when I did mine it took me 15-20 minutes tops.   Good luck