That's pretty much how it was for me in secondary school in the late 80s/early 90s. We only left the classroom for subjects that required specialist equipment - e.g. sciences, art, music. Everything else was taught in the form room.
If nothing else, having the students move between classes cuts into teaching time.
That certainly wasn't the case when I was at school in the sixties. We moved to different classrooms for each lesson. There was the English room, the history room, the geography room etc. For one thing, all the relevant textbooks were kept in the respective rooms and the relevant teacher was based in that room and was the form master/mistress of the class that was based there. It was a ritual to flip up the lid of the desk you were sat at to see what the "owner" had left in it.
We had one room for "registration" at the beginning of the day and then moved around the school as required for each different class; teachers were generally fixed in one room. It probably wasn't the most efficient way of doing things, but it was interesting to see how different teachers customised their classrooms in what was a fairly nondescript 60s brutalist building. Our modern studies teacher had a drawing on the back room of the class that depicted the US on one side and the USSR on the other, along with cartoon heads of the leaders of the day; in the middle was a big hole where the UK was supposed to be and the captions from both leaders said "oops".
We had one block with X and Y floors: English and modern languages were taught on the former; maths, modern studies, history and classical studies were on the latter. Latin was still around, but the year before mine was the last to be taught it - that teacher wore an academic gown, which we all thought was a bit strange!
"Specialist" subjects had their own floor in the tower block:
A) biology, home economics and, latterly, computing
B) chemistry
C) physics
D) secretarial/business studies - I don't think I ever visited that floor
E) geography
F) art
"Techy" had its own block with rooms numbered T1, etc. (funnily enough), as did music and PE (M and G, respectively)
I was about to apologise for going off-topic, but there are a few things that are certainly anachronistic now: the belt/tawse is one - my secondary years started in 1986, but it was still on the go then; how many schools have forges, lathes, band-saws and other industrial machinery these days?
Also, computer networking was in its infancy and we had a single segment of co-axial cable that ran through all classes, with an "access point" in each class that consisted of a short loop of co-ax that could be disconnected in order to allow a computer with a T-piece to be plugged in; invariably there would be some individuals who forgot to replace that loop once they'd disconnected their computers and the network would grind to a complete halt - many of my computing classes consisted of having to run round, knock on doors and interrupt other classes while we checked that all the network connections were sound.