Yah, just did that one during my week for Aircrew Selection. They put all 14 of us Pilot applicants thru the AEC testing as well.
Not much anyone here can tell you. As you can imagine, we are asked NOT to divulge anything. I can honestly tell you that digging for specifics about the testing on here wouldn't help you anyways! Kinda like trying to study for a blood-test!
They're looking for inherent skills within you, NOT what you've studied over the past month. They are not testing how well you can fly planes or direct traffic. They've carefully developed or chosen specific tests to look for very specific aptitudes, to predict how well you COULD BE TRAINED to do those tasks.
Don't sweat! Enjoy the trip... They're paying for it, right? Be well rested when you arrive, dress sharp, go in confident. It's challenging but fun!
'G.