Is cockpitweb's aptitude software useful?

[glho]

I'm having aptitude test from KA next week, and I heard that the aptitude software from cockpit.web is somehow almost the same as KA's, would it be worthy if I buy the software for practice? Since it's quite costly, which is around $1,800 HKD. Plus, there has been some sayings that the test focuses more on your improvement after each trial and it is not necessary to buy this software as long as you have been a frequent gamer, is that true?

Anyone tried out the software took KA's aptitude test? Please feel free to share you experience about that! Thanks!