Hi Gadfree,
There are no aptitude or any form of verbal nor numerical reasoning tests. The sim and board interview are well covered in this thread. They are very pragmatic and I believe VERY focussed on the individual and CRM. Sure know how to define what kit you need for RVSM airspace etc. Expect a significant amount of behavioural questions. Nothing too deep IMO. Just common sense. Rista320 gives a very good summary.
Good luck.