Gosh I have not even considered this. My 6th grader is taking algebra now, and will be taking Geometry next year in 7th grade. We are in PA in a very competitive school district. There are 4 kids in 6th grade taking algebra in total (out of around 350 kids) and about 60 taking it in 7th I believe. No one has talked about "gaps". Starting to wonder if this could be an issue.