If your doing it at Cranwell its normally the full set of RAF tests. Heard somewhere however, that if its at a careers office could be the Pilapt tests - do a search and see what you come up with. CTC use it for their selection.
The CTC version was harder than the RAF tests. I took it with two Linton boys and none of us passed. However, your applying for the RAF - and I don't know what the standards are I'm afraid.