The prize for the highest academic rank of all Colby sports teams goes to Tricia O'Brien's women's basketball squad, boasting a 3.3 cumulative GPA with 10 of 15 members on the Dean's List. The Women's Basketball Coaches Association has ranked the team 19th on the WCBA Academic Top-25 team honor roll.     Next, at Colby, comes women's volleyball and women's squash, each with 3.2 cumulative averages. Seven of eight players on the volleyball team are Dean's List members. Tops among the men's squads is Sura Dubow's swim team, with a 3.1 cumulative GPA and 10 of 15 members on the Dean's List. Men's squash, ski and track teams are close behind, each with 3.0 averages.