A few differences between MATHCOUNTS and MATH CLASS
MATHCOUNTS does NOT replace your child's Math class.
MATHCOUNTS does NOT have anything to do with what math class your child is enrolled in.
MATHCOUNTS is a "club" similar to pathways or TSA. https://www.mathcounts.org/
MATHCOUNTS is given a class block to prepare for competition similar to robotics, band, pathways, ...
We hold one tryout for students to qualify for MATHCOUNTS. If your child does or does not make the team it does not affect their mandatory math class.
If your child becomes part of the MATHCOUNTS team then your child will take 6th, 7th, or 8th grade math and will also have a MATHCOUNTS block. So they will have two math classes.