I strongly disagree. Testing isn't necessary, particularly not the meaningless multiple-choice standardized money-makers that pass for real assessment and have a stranglehold on public education these days. There's a long history of devastating criticism of such tests that goes back to before I was born in 1950. You owe it to yourself to look at what physicist/mathematician Banesh Hoffman was saying about the SAT and College Board in THE TYRANNY OF TESTING, written before I was in high school. I suggest, too, that you read Stephen J Gould's MISMEASURE OF MAN for an incisive critique of the history and practice of intelligence testing and its racist roots.
Where, exactly, is it written in the US Constitution, "Thou Shalt Measure, Compare, and Judge Children," let alone do so based on test scores?