I think this thread may have drifted some what from phycometric testing to ASA ATC recruitment in general...
So to get back to the stated phyc testing, there are ways increase your chances of successfully getting through... You can't cheat in a phycometric but you can teach your self the cognative skills required.
The secret to getting through is here at
www.lumosity.com. There are a whole lot of simple games that you do each day that are designed and proven to improve you cognative skills, including problem solving, attention, memory, speed and flexibility.
You do have to pay for the site but I used it every day and it does do what it promises...
Worth checking out
Cheers
Kieran