have a look at
www.cockpitweb.com they offer software, at a cost, that should allow you to practice aptitude tests, numerical reasoning and psychometric tests similar to what you might expect from the airlines.
www.pilapt.com will show you the types of tests you may come across but you can not practice them on line.
Or you could look up pprune under pilapt to see if others have explained it better for your given flight school.
Hope this helps.
sollas