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Imperial Avenue Holbrook School is an alternative education school for 9th-12th grade students. Our office hours are from 7:00 a.m. to 4:00 p.m. The school office telephone number is (760) 355-3207 and fax number is (760) 355-3258. Classes begin at 8:30 a.m. and conclude at 12:55 p.m.