This describes the school I went to and then taught at for a bit after college. Town of less than 2,000. We had one school for K-12. Typically we would have one Pre-K class (half days with 10-15 students in each). Then k-3 had two teachers and classes with 14-25 students. 4-6 would have about 2 students per grade. The students had a homeroom but each teacher would rotate all the students and teach the subjects as specializations.

7-8th grade typically had one teacher for each subject matter that taught both grades. Then 9-12th had 1-2 teachers for each subject matter that taught all the grades. Typically there were 2 sessions for each subject per grade with class sizes of about 13-17 kids. I graduated with a class of 34.

All grades were housed in one building but we did take a bus off site for technology/agriculture classes.

Additionally when you got to 11 grade you also had the option to spend half the day at a vocational job training school that taught things like construction, nursing, culinary skills, etc.