Only certified school in Oregon, Portland and Beaverton. BBB A+ rating school. 25+ years in business. Award-winning teachers. Students are competing nationally. A student’s ability to do calculations quickly builds confidence to compete and succeed at all levels, starting from elementary ages through examinations such as SAT, GRE, GMAT and beyond. Abacus gives any child the skills and confidence to excel in STEM related subjects beyond the classroom.