Fabbe,
I'll give you some advice about "how to train for mental tests"(?)
Firstly, stop your inane, rambling posts. You have very little experience of life, never mind aviation. There are people on here with vast amounts of both.
Listen to them.
Research.
Formulate a plan. Think. Stop being so reactionary. If you want to get into this industry and want people to stop refering to your age, you're going to have to demonstrate a lot more maturity than you are showing now.