Harrison College is accredited by the Ministry of Education and Human Resource Development of Barbados. Entry to the school is based on the results of Barbados Secondary School Entrance Examination. The school has the fortune of receiving the top performers in this examination, which accounts for its high academic reputation.
At the end of their fifth year, students write the Caribbean Secondary Education Certificate (CSEC)examination set by the Caribbean Examinations Council (CXC). This examination has replaced the Cambridge General Certificate of Education Ordinary Level examination and is of equivalent standard. At the end of each year in the sixth form, students write the Caribbean Advanced Proficiency Examination (CAPE), also set by the CXC. Typically, Harrison College maintains a minimum 75% pass rate at CSEC and 70% at CAPE. Since 1990, 150 students have attained Barbados Government Scholarships and Exhibitions.