The grading system uses A-F designations. Teachers' grades and comments are reported to students and parents seven times per year, with seven additional mid-module reviews of each student's progress. There are 90 boarders and 200 day students. Students come from California, Florida, Illinois, Louisiana, Maryland, New York, North Carolina, Oklahoma, Pennsylvania, Texas, Virginia, and all six New England states. International students come from China, Germany, Ivory Coast, Japan, Korea, Poland, Russia, Singapore, Taiwan, and Tanzania.
Day students commute from more than thirty nearby communities.
The Cambridge School of Weston Student Handbook outlines the rules governing life on campus. A student-faculty Judicial Board makes recommendations to the Head of School on many rule infractions except for illegal substance use, which results in automatic penalties of suspension or expulsion. CSW maintains a smoke-free campus. The academic facilities surround a broad quadrangle and include nine buildings housing classrooms, the library, a computer center, five science laboratories, and the new Mugar Center for the Performing Arts, the Cohan Academic Building, and the student center. The athletic program is designed to help students develop habits of good health and good sportsmanship and learn to be cooperative members of a group effort.