You are only allowed 2 attempts at FATs. The flying scholarship does count. However passing the FS FATs is not enough for entry into the service and you have to complete the full battery of tests. If you passed both P & O there is no need to retake them. If you failed the FATs and just dipped out you may well be offered a second chance to do them although usually a year has to elapse before you can retake them. If you stoofed them completly and you are unfit to be in charge of a moving vehicle let alone an aircraft then it is unlikely you will be offered the chance to take the tests again.
Hope this helps.
Jucky
FLY NAVY!
(EAT CRAB!)