Berkeley County was the only Lowcountry school district to buck the statewide decline and see its scores on the SAT college entrance exam rise this year.
The average composite score in Berkeley County schools rose 26 points to 1,447 in 2011; a perfect score is 2,400, or 800 on each of the exam's reading, math and writing sections.
Scores in Charleston and Dorchester fell. Charleston saw its average composite score slide 11 points to 1,426 while Dorchester 2 fell 14 points to 1,451. Dorchester 4 declined 11 points to 1,367.
The state Department of Education released statewide information last week that showed students overall fared worse on the exam for the third consecutive year. The overall average SAT score for all Palmetto State high school seniors, including those in public, private and home schools, was 1,436, down 7 points from last year.
State officials did not release individual school and district-level scores until Tuesday because they said they were waiting for recalculated information.
The College Board included two additional months of SAT scores in the 2011 results, and the Education Department wanted the scores to be adjusted to enable year-to-year comparisons.