Gapan Test
Re the query regarding the private GAPAN aptitude tests counting as one of your RAF attempts. Yes, is the answer. Your name and address are kept on record and if you were to subsequently take the test with the RAF your score would be adjusted accordingly.
You should remember that the pilot aptitude test is only one of several different ones that you will take on your OASC visit, you will be tired and stressed rather than on a private GAPAN visit where you will be relaxed and rested. Having said that, GAPAN staff are mostly ex-RAF and a visit to Cranwell to take the test with them will give you a reliable indication as to your chances of becoming a military pliot.
Trust me, only the very best get in.