By the time Claire Beth Tomasiewiez graduated from Weston High School in 1975, her teams had compiled a four-year win/loss record of 69-1. In 1974 and 1975, Tomasiewicz’s Weston High teams won the C.I.A.C. Class M State Championship. She became the first high school girl in the state to score 1,000 points, and set a single game record of 52 points. She tallied 1,603 total career points at Weston.
In her junior and senior years, Tomasiewicz averaged 30 points a game and finished with a career average of 22.9 points per game. She was named to the New Haven Register All-State First Team in 1974 and 1975 and was a member of the First Connecticut Schoolgirl Shoot-Out team (1975), which defeated Massachusetts.