Regents is not optional.
When I took math in 12 grade it was considered Math IV
That is the math starting to be taught in 8th grade now.
I am fine with challenging my kids but testing does not challenge it does not make them learn and it does not tell us if a student is comprehending the material. We only have them because of the tests students overseas take.
Our country still produces on average more college graduates that came from the public education system percentage wise than any other country.