The Bromfield School is the only public high school in the state at which all tenth-graders have passed the MCAS for two years in a row, according to Superintendent Joe Connelly.

Only a few charter schools achieved similar success, he said after the Oct. 11 School Committee meeting.

Perhaps more significant, Connelly said, was that Harvard students at all grades met the standard for “adequate yearly progress” under the No Child Left Behind Act.

When a school’s students are already performing at a high level, Connelly explained, it becomes progressively more difficult to achieve the required year-to-year improvement.

Results of last spring’s MCAS tests came out in mid-September, but the results for all grades have not yet been fully analyzed, Connelly said. He plans to present a complete report to the School Committee in November, he said.

MCAS results published in the Boston Globe show that Bromfield was among the top five high schools in the area, based on percentage of students scoring in the “advanced” category in all three subjects tested: English, math, and science. Of other area schools, only Lexington High School finished in the top category in all three subjects.