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Based on current revision of the tag-wiki and tag-excerpt, the tag contest-math seems to be a meta tag. In short, the usage guidance says that it should be added if a questions is from a mathematical contest, which means that it is actually not determined by the content of the question, but by other factors.

For example, we have a few questions almost disjoint families of cardinality $\mathfrak c$. Such as Can a countable set contain uncountably many infinite subsets such that the intersection of any two such distinct subsets is finite? (and many posts linked there) or Partitioning an infinite set (and many posts linked there).

Based on current revision of the tag-wiki and tag-excerpt, the tag contest-math seems to be a meta tag. In short, the usage guidance says that it should be added if a questions is from a mathematical contest, which means that it is actually not determined by the content of the question, but by other factors.

For example, we have a few questions almost disjoint families of cardinality $\mathfrak c$. Such as Can a countable set contain uncountably many infinite subsets such that the intersection of any two such distinct subsets is finite? (and many posts linked there) or Partitioning an infinite set (and many posts linked there).