Empty pockets. A strong year at Sandhurst means doing extremely well, ie getting good results. Being accepted for Sandhurst is the first hurdle. You then have to convince the Regt/Corps of your choice that you are right for them. They will look at you and make THEIR choice. Obviously the AAC require a different sort of person to fly their aircraft than the Royal Logistic Corps need to look after their trucks.
If you're still thinking Army, then don't believe everything that you're told at the Careers Office. Unless the person you speak to is AAC, then they'll have little idea of the life and times of an AAC officer.
If you can, try and get a visit to an AAC Regiment, either at Dishforth(Yorkshire), Wattisham(Suffolk), or even a visit to the AAC Centre at Middle Wallop(Hampshire).