We've not experienced gradeskipping, but I thought I'd say welcome. You might check the books by JD Hirsch (I think) called "What Your Nth Grader Needs to Know", specifically for the 1st grade. That would give you an idea. You might also check your school's website and see if they post a concept map. Other than that, I'm clueless. I'm sure someone will jump in soon and offer more help.

Welcome!