To answer the actual question:
It usually covers accelerating, i.e. floor it up to 150 or more (depending on car).
You also get to stand on the brakes, feeling for the limit, where the ABS is just about to come in.
You can do this from 100 without touching the wheel. You will appreciate how well it stops.
You can steer and swerve about while braking and the stability control sorts it all out.
You will have some handling session, on a circuit of some sort with a mixture of corners.
In some ways it is better in the wet, since the limit is lower and you can feel the car slide.
If you are smooth and balance it correctly, you can slide and drift the car without the PSM cutting in.
You may also have a high speed bowl (if at Millbrook).
I would like to do it again, to see where I could now do better.
Although it only lasts a few hours, it's probably about as much as you can absorb in one go.
All the instructors are good guys who don't have anything to prove, so you don't need to feel intimidated (which I did at the start).