In 1967, as mandated by the Ministry of Education, the school officially changed from a Senior School to a JuniorSecondary School.After serving for six years as principal, Mr. J. W. Davis retired in August 1967, and Mr Donald Collins assumed the role of principal on September 1, 1967.
Mr. Collins pioneered a number of initiatives which formed the framework for the Junior Secondary School System in Jamaica. The problem of inadequate student accommodation, not only at Tarrant, but throughout the island, was a cause for concern. Through Mr Collins’ discussions with the Ministry of Education, a decision was taken to experiment with the shift system. The shift system at Tarrant Junior Secondary School started in September 1972, with approximately 1,350 students and a staff of 70 teachers. In 1974, with the introduction of Grades 10 and 11, the school became a New Secondary School offering technical and vocational programmes.