Certificate of Appreciation, 10 x 8, from the Abraham Lincoln Preparatory High School to Maureen O'Connor for her service in their Booster Club Activity, 1987-1988. Lincoln is a public high school in the San Diego Unified School District. It serves students in grades 9-12, located in the Lincoln Park neighborhood of Southeast San Diego. A booster club, popular in high schools, is an organization formed to support (e.g. coordinate events, contribute money, etc.) for an associated club, sports team, or organization.