The Belgian Air Cadets Gliding Program is in a different league altogether - very selective and prospective candidates must have the academic ability that would be required to join either the Belgian Air Component or the airlines.
Selection for the 3-year program - around 50 slots a year for the entire country - is highly competitive and by interview held at the Belgian MOD.
For instance, 5 of the 6 F-16 pilots on this course in 2017 had previously been in the Belgian Air Cadets Gliding Program.
https://www.aviation24.be/military-a...d-f-16-pilots/
All flying is done at periodic camps a couple of times a year with pre-requisite academics to be passed first.
Global Air Power Media - Belgian Air Cadets
A few course videos here give a flavor of the equipment used and the type of cadet selected: