You can most definitely change schools, in fact, I run two alongside each other. I'm at uni, so in term time, I fly at Thruxton, and at home I fly at Nottingham. Doesn't seem to make a bit of difference, the aircraft are the same, and the syllabus is the same! The price is too, come to think of it. If anyone's interested (which I doubt) I prefer Thruxton - it's those PAPI lights that make all the difference. That and not having to dog-leg around all the little hamlets of Nottinghamshire in the circuit.
Happy landings
Ginge