When I coach for PonyClub, it depends on the level and what the students are working on.
If they are headed towards an uprating, we run a mock rating. For most of our kids, high Ds and Cs, this means we work on the grid that's required, making sure they understand the purpose and can successfully navigate through it.
As long as the kids can handle the grid, we move on to course work. Setting up different elements that are required for each level.
An important part of the mounted meeting is that the riders learn to critique each others rides as well as the coach critiquing and providing feedback. As you develop as a rider you will need to be able to describe your strong and weak parts, what your warm up is, why and what you will do differently next time around.
I'm not sure this is how it's run everywhere, but this is what our coaching staff does. Also, for our club, the coach for the mounted meeting is never their regular trainer.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse