KJP, DD attended 1st grade at a school where it was really loosey-goosey and I was never certain what the kids were learning. Sometimes, the kids at her school surprised me with their depth of knowledge in one thing, and other times I was shocked by their lack of knowledge in an area I would think they should have mastered by then. I started asking parents that had their kids graduate from that school (school only went up to 8th grade) how their kids adjusted to their new school. Based on those answers, I was able to make the decision to move DD out of that school. Maybe the common core guidelines for the grade your DS is in will give you some idea of how their curriculum aligns with a standard. While I am not a fan of the way CC is implemented, it at least provides a baseline for comparison.
http://www.corestandards.org/read-the-standards/
