As well as teaching different subject in schools, we need to consider merging different classes together and moving information around.
Classes should not be so disparate from one another. Much of the material taught in school is put together in a very patchy and non intuitive way. A great deal of context and potential synergy is lost because we refuse to allow different subjects to be taught together. Certain classes need to be merged into single units. Having students move from one class to another is also very inefficient. Instead, students should remain in larger classrooms for longer periods of time with a modified class structure.
Many classes need to be restructured to address current needs and current technology. The classroom of the future will teach subjects at a much more accelerated rate with online material. Many existing classes need to be either reduced very dramatically or removed all together.