Registration Information (Click for downloadable Spanish translation) 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. Use THIS LINK to register. Please direct questions to the CHS Counseling Department. Office hours are 7:15 a.m. to 3:45 p.m. or […]