The Right Stuff
Aptitude testing only proves one thing conclusively, and that is whether or not you are capable to passing an aptitude test. Interviews, group sessions etc can all be prepared for with external professional help readily available, for a price.
As you can purchase the various "copy cat" versions on line, a well prepared student should be capable of achieving 95%+ during the formal testing.
I am surprised the various tests are still used as they are fatally flawed in what they are meant to demonstrate.
Those who are really interested and have a overwhelming passion, will do a few hours at a gliding or flying club to see how they shape up.
A competent instructor will know within a few trips whether you have what it takes. The acid test is setting a known attitude and TRIMMING, together with "a nice pair of hands".
Just ensure that the academics are sound as well.....