Your son is an established 'local level' player who may be getting frustrated with a lack of opportunity to improve and play with better players. He may have already had trials with professional clubs or development centres. He needs more attention on the specific things he needs to work on to meet his FULL potential. He is an ambitious player and wants to find out how far he can REALLY go in the game.
Players access Advanced groups on a invite-only basis starting at Under 9 and going up to Under 15. It is a requirement to be enrolled on the 'Foundation' Programme in order to access the advanced Programme.
The nature of the advanced groups is a higher level of training with greater intensity and focus. The expectation is that all player have the goal of playing Pro Academy Football and the preparation of each player is applied accordingly to those standards. There is also an expectation that Advanced players will accept and complete additional challenges set by their coaches.