High School Classes May Be Advanced in Name Only

But other studies point to a disconnect: Even though students are getting more credits in more advanced courses, they are not scoring any higher on standardized tests.

The reason, according to a growing body of research, is that the content of these courses is not as high-achieving as their names — the course-title equivalent of grade inflation. Algebra II is sometimes just Algebra I. And College Preparatory Biology can be just Biology.

Lynn T. Mellor, a researcher in Austin, Tex., who has studied the phenomenon in the state, compares it to a food marketer labeling an orange soda as healthier orange juice.

The 2009 results — the most recent available — of the federal test that measures change in achievement levels over decades showed that the nation’s 17-year-olds were scoring no higher in reading and math than in 1973. SAT scores have dropped or flat-lined, too, since 2000.

But a federal study released this month of nearly 38,000 high school transcripts showed that the proportion of graduates completing a rigorous curriculum rose to 13 percent in 2009 from 5 percent in 1990.