Stage 2 of the selection process is the aptitude testing i.e the PILAPT tests and the mathematics test. If you are successful at this stage, you will be asked to attend an interview etc in the afternoon which is itself stage 3 of the selection. Success at this point means you then do stage 4 which is the test in a simulator. If you are successful here, you will then have to pass the JAA/CAA class 1 medical exam-and if you pass that, your place is secured (which is then subject to the small matter being able to finance it!)
That's a very brief overview, if you visit the thread
here, it goes into the stages in a bit more detail. You will most probably find all the information you need in the first few pages.
Good luck with your application!!
dunelmitepilot