Not that this means much, and idk what it compares to in other towns, but the schools here get about 70% of the towns budget. I would also recommend doing some research on how the town runs things, there's usually chaos every year with the budget, lots of interim managers and other rotations, there is a fire tax that you pay separate from regular town taxes because of the fire district setup, etc.

I don't have any kids so can't speak to specifics, but I do have many friends who went through the Coventry school system and now their children do as well. Of course, ymmv.