The issue: Since scores show close correlation to family income, the single most effective reform would be a rising and widely distributed prosperity for all

The high school class of 2012 has taken its College Board exams and the results are not good, showing the nation still hasn’t cracked the code of how to deliver a quality secondary education to large numbers of students from diverse backgrounds.

THE RESULTS are dismaying because they come after a decade of No Child Left Behind. If that law forces teachers, as critics allege, to “teach to the test,” it is not this test they are teaching to.

The test is divided into three parts: critical reading, writing and math. A perfect score on each section is 800 — 2,400 if the student aces all three.

But mean reading scores were 496, a 40-year low, 34 points below 1972 scores. Math was flat at 514, roughly unchanged since 2007. And writing was 488, down nine points since that section was added to the test in 2006.

More than half of the test-takers, 57 percent, did not achieve a combined score of 1,550, the level at which a student is deemed ready for college-level work.

The results were even worse at ACT, the other major college entrance exam, where 75 percent of the students failed to meet the readiness standard.

Scores across every racial group, except those of Asian descent, have declined since 2006.

EDUCATORS ADVANCED ancillary reasons for the poor showing: a record number of students, 1.66 million, took the test; 27 percent were from low-income families; 28 percent said English was not their first language; and one-third were from families where the parents had not attended college.

But overwhelmingly, the single greatest factor correlating to achievement was household income. Students from families earning $20,000 or less had a mean combined score of 1,322. The scores increase in stair-step fashion with each additional $20,000 in family income. But the threshold readiness figure of 1,550 wasn’t reached until household income approached $100,000. The mean combined score for students from families earning $200,000 or more was 1,722.

This suggests that most of the much-discussed education reforms — more testing, stricter teacher evaluations, smaller classes, charter schools — might result in improvements, some of them perhaps significant, around the margins, but that the single most effective reform would be a rising and widely distributed prosperity for all.

Over to you, Congress.

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