Tilden Prep is a unique, WASC-accredited, college preparatory school in Walnut Creek for grades 6-12 that teaches UC-approved courses one-to-one and in small groups. We also use mastery learning, teaching students to 80% (B) or higher level of mastery before moving forward. This allows us to individualize the pace and teaching method to address a wide range of learning needs for our students in the East Bay / Contra Costa area.