Sure. (Note the info is a few years old, so I can’t guarantee how correct it now is?
It’s largely based around a “dry-run” of PGSC/PROC, with a chance to try all of the selection tests - I’d strongly recommend it for anyone thinking of applying as it will give you a good idea of whether you’re physically and mentally ready (spoiler - about 90% of the cadets on the course I saw weren’t - but at least it gave them a frank and clear idea of their chances).
You’ll also do some fieldcraft and leadership/teamwork stuff, and have the usual chance to socialise with your fellow cadets.