BURLINGTON Classroom teachers at Mater Christi School gathered in the computer lab during their second in-service day for a review of the materials and sites available to them and their students on the internet. Michael Early of Huntington, school technologist, also introduced the updated software for the new marking system. Mater Christi School co-principals, Bev Broomhall of So. Burlington, and Brent Tremblay of Milton, had announced earlier that the school would be adopting a trimester schedule this new school year for issuing report cards and progress reports. ThiS move necessitated some changes in the computer system at school and some guidance for successful implementation of the plan.