I've heard of a 75% failure rate of APC's in Abu Dhabi.
Perhaps this is a result of GAL (Abu Dhabi) not paying any travel expenses (flight/hotel) for people to attend the APC so the level of candidates is understandably lower then other ME locations. They should either hire based on interviews if they want to be as cheap as they are or pay for suitable candidates to attend the APC like DANS, SERCO as well as others do.
The APC in Abu is somewhat archaic and not relevant. The system/ equipment they use is cumbersome and distracts from the candidate's abilities. ATCO's who have high density time at very busy US radar sectors have failed this evaluation.
Roll the dice, pays your money and takes your chances if you're feeling lucky!