Should have tried harder at school.
Job: Administrative Officer
Qualifications: 5 GCSEs/SCEs and 2 A-levels or 3 Highers
Job: Pilot
Qualifications: 5 GCSEs/SCEs and 2 A-levels or 3 Highers
As you can see these are the educational requirements for two jobs in the RAF and as far as I can see, you don't actually have to work harder at school to be Aircrew.