mingmongaloo, (a very hot Chinese curry perhaps?).
The 3% figure is probably fairly accurate.
The statement that the tests "weed out the people who WILL NOT pass the college, and those who WILL NOT pass the validation", is alarmingly misleading.
Don't forget the responsibility for the safety of those on the ground too, over whose homes and businesses, NATS conducts its operations.
Best of luck with Stage 1.