I took the ASC testing at the end of February 2017 and it was a challenging test. You will study the best you can but when you get there a lot of what you studied and techniques that you may have used to prepare will be largely thrown out the window. My worst activity was the Airborne Numerical Test (TSD). The only hint I can give you is that its format is very different from what is on the study package. It will require not only your ability to do the math in your head quickly, but to collate information to lead you to the correct answer. My best activity besides the psycho-motor tests was the Target Recognition Test which requires your ability to multi-task and maintain situational awareness.
The test really is not all that stressful as some have told me or some have mentioned on this thread. Its just very difficult due to time constraints and the importance of speed and accuracy play a role. I went in there determined and had fun with the test, because some of the activities were actually pretty cool. The way to help keep my cool was to blow off some steam at the gym each day before the testing to calm the nerves.
Study your TSD, mental math, even work on activities that require multi-tasking, practice your memory. Luminosity will help in some areas like the digit recall test, target recognition test, some spatial tests, but do not rely heavily on it. And for System Logic Test, I suggest you up your reading comprehension skills. For the situational awareness test, practice recalling details of particular movements around you. This particular activity will kick you in the butt.
For Pilot, it not solely based on psycho-motor skills as I thought it was. The Captain there told me that because of the advanced systems on the today's aircraft, future Pilots need to perform beyond that of hand-eye-foot coordination and perform in the cognitive dimensions (ability to work 3D Space and manage the a/c systems, read maps all while flying). So in addition your numerical skills is actually quite important. In fact every aspect of this ASC is very important to successfully getting Pilot, not just few parts. So study holistically, but efficiently so you can be effective on the ASC.
At the end, I learned a lot about myself; what I can do and what I need to improve on.
Go there with a great attitude, talk to the people who are in on the experience with you. And when you get the short intro to AEC, ACSO, PILOT ask questions so you are fully aware of the possible positions that may be your future.
Good luck and if you have any questions feel free to PM me.