I've actually been considering this for quite a while but I've been dancing at my current studio for a long time and I'm not sure if I would regret the change. My current studio is one of the more professional studios out there in my city and the teachers are quite amazing, but I always thought the progress was really slow (unless you decided to take academic classes there too, like an actual pre-professional school, which I didn't). However, this year I was planning on taking RAD 5 (which also means pointe for me!) but the time interfered with another dance class I did. And when I asked them if it was possible to change the times of the classes, they said, no they couldn't, but they could let me take RAD 4 and depending on my progress, I would be able to skip RAD 5 next year and go straight to Inter. Foundation.
I was really disappointed because I was excited to finally go on pointe, which generally happens in 5 and never earlier. (My mom isn't really happy about dropping a level, either, and she doesn't believe I will actually be able to skip a level.) So that's when I decided that maybe I should change studios and find a class would suit my needs, but that's scary and stressful and I don't want to sacrifice quality just so I could take the class I wanted.
tldr; I was dropped a level because class times interfered and now I'm considering if I should stay hang in there for a year or just switch studios now