I second the above.
The compass test is probably one of the most reasonable assessments around. It's designed by pilots,, for pilots.
It doesn't catch you out, there are no tricks, you can't really prepare for it anyway. It's just aptitude.
There is no set score you need to pass, it has a fluid pass mark. A 5/7 today is not the same as a 5/7 next year. It just shows what percentile you fall in.
Remember, you don't have to be amazing, at all! It's not an evaluation tool. It's just a handy kit of software that tries to evaluate potential training risk. You're allowed to have weak points in your profile. Most people have 3 or 4 areas that the software picks up on that MIGHT influence your training. They still get taken on
It's all part of the game.
They just want to see you're not a complete tool. Preparing won't help you! Just relax, really, don't stress yourself out over this .. I know it's easy to say online, but in my experience, it's by far the easiest part of the entire assessment loop!