ACI Institute 23367 Golden Springs Dr, Diamond Bar, CA91765 ACI Institute is an after-school tutoring center that specializes in the preparation for standardized exams. It offers…More prep courses for the SATs, SAT subject tests, ACTs, APs and PSATs. It also provides such courses as English Enrichment, Math Enrichment, Writers Workshop, Speech and Debate and English as a Second Language as well as college admissions consultation. It was founded in 1987 and its programs are geared to helping students succeed in school and to enter top-tier universities. It boast of having 95 percent of its students accepted into the University of California system, and the classes have a proven record of improved scores. ACI institute is located in the Diamond Bar Village Plaza with ample parking.