Mathcounts is a competitive math program for 6th graders. The Mathcounts website can be found here.
Traditionally at Azevada, a sixth grade parent organizes the group.
If there is interest, and a coach is available, I would recommend basing the group around the format proposed by this organization:
If interested, please contact me (katie.e.chin@gmail.com). I'll set up a page for the 2022-2023 team on this site.