All three of mine were far past K material in K and their experiences depended on the teacher and the peers in their classes. They all had to practice counting and do ABC work with their peers, but my kids also had some opportunities to do higher level math, to read higher level chapter books with their peers, and to do interesting projects related to those books. The availability of those opportunities differed between kids depending on the teacher. Kid #3 had some behavioral issues in K that may have been related to boredom, but those issues may have surfaced anyway because of his personality.