Righto,
Instead of paying a fortune for a class 1, research the requirements for a Class 1.
The big ones that "take people out" when young are colour blindness and diabetes. Also, visual imperfections beyond 5 dioptres will take you out. So, you can get your eyes tested "cheaply" and get a simple health check that'll give you an idea.
To find out your general aptitude, look up "GAPAN" and do their tests. They can give you impartial advice about how to proceed before spending a shed load of cash.
Good luck.