- Missing that in-person school time meant losing a lot of "leaving home" practice for a large chunk of kids. Current second graders were in-person for 6 months of kindergarten, and remote from there. This means there are a lot of mechanical and social things they haven't had to do (sit quietly next to each other, tie their shoes, ask to go to the bathroom).
- The "summer slide" has been much more severe than usual. A large chunk of the students didn't get much education out of being remote for first grade, so a much-larger-than-usual chunk of the cohort are substantially behind grade level for basic skills, especially reading.
- Related to above, there has been a huge backlog of students who need to be evaluated for various special education and disability needs who just haven't been able to be accommodated and who, due to the process difficulties for the last year, probably won't be able to be evaluated based on their data from last year (leaving them severely under-supported for another year while the data is collected).