In this replication of the 1972 and 1974 studies of reading and mathematics achievement in North York, Ontario, approximately 20 percent of the students at each of the proposed grade levels were included in the sampling. Again, the Metropolitan Achievement Test, the Sequential Tests of Educational Progress, and the School and College Ability Test were used. The 1975 results supported the 1974 findings that North York achievement in both reading and mathematics compared favorably with the American norms in all the grades tested. They also indicated that the average growth of the schools sampled was wider in both reading and mathematics than in previous years. (Author/BW)