Registration Information (Downloadable Spanish translation coming soon!) Collinsville High School accepts summer school registration on a first-come, first-served basis. Registration for summer school opens May 1, 2023 and closes Friday, May 12, 2023. Please direct questions to the CHS Counseling Department. Office hours are 7:15 a.m. to 3:45 p.m. or call (618) 346-6320 ext. 1122. […]