If you are referring to
https://pilotaptitudetest.com/ then save your money it wont help you (my opinion). There is another similarly named website (pilot aptitude systems) which I believe is a well known scam. If it costs hundreds to thousands of dollars it's not worth it.
If the ADF are using the same weightings as the RAF (highly likely) then each of the 7 domains has a roughly equal weighting (11-16% of total score) for pilot whereas ATC/ACO is skewed heavily towards "strategic task management". Each domain has a specific stanine cutoff from the 2nd-5th stanine which in statistical terms essentially ranges from below average to average. One could assume the ADF gets a slightly right-shifted distribution of individuals compared to the general population so below average may not appear as so. If you fail to meet the cutoff in any domain you do not pass for that role regardless of overall score.
The testing feels very much like an "either you have it or you don't" situation. As far as preparation goes, I could only confidently say that mental maths practice had a definite positive effect on my score. That and 20+ years of solid video games is likely your best bet for success. So go do your timetables and play some PUBG.