Sat, and passed, the Jerez selection tests. They are the generic types of questions that you will find at any company taking on new staff/cadets and if you brush up on your personality and maths quiz, you will be fine. The only thing that I was not able to brush up on was the eye to hand co-ordination task, but they were nothing to sweat about. As for necessary? Well, it is a formality that has to be endured, but none too stressful at that!