In the books the Gryffindors donít share any lessons with the Ravenclaws before NEWT level. I have two theories on this.
1. They just donít
2. This is the Hogwarts method of streaming. Since the Ravenclaws are more intelligent they are taught at a faster pace that less able students in other houses wouldnít be able to keep up with.
I would like to know which of these seems more plausible or if there is something else that I have missed. Also if option 2 is correct do you think that the Slytherins and Hufflepuffs share any lessons, I am leaning towards History of Magic given that there doesnít seem to be much help given to individual students.