If you want to get focused I suggest using one of the many flash-games available instead of spending money on skytest.
Tetris is a good example, you need to think quickly and stay focused.
Here's another example:
Play Multitask, a free online game on Kongregate
If you want to use skytest then fine, do so. But I sometimes feel a lot of people on here try to cheat the system rather than to trust their instinct and practice the obvious things. If you want to try and get more focused then by all means practice but use one of the many simple means available. Spending money and time on a practice software to try and pass a test that is not meant to be practiced is in my eyes the wrong way to go about this process. Work with the system instead of trying to work around it.
Just my thoughts, which will most likely upset some people, but that's how I see it anyway.