Results from the 2011 National Assessment of Educational Progress were released Thursday. The study also shows the state's science scores have dropped slightly from two years ago.
Pennsylvania students scored 151 last year, compared with 154 in 2009. About 33 percent scored proficient or higher, compared with 35 percent in 2009.
The report indicates U.S. eighth-graders overall are doing better in science. The average score was 152, up from 150 in 2009.
However, seven out of 10 students nationwide are not considered proficient in science. Only 2 percent have skills advanced enough to lead to careers in the field.
Most states had flat scores compared with 2009.