{"ap_courses":21,"ap_rigor_national_percentile":90.1,"at_a_glance":["Crystal Lake South High School is a public high school in Crystal Lake, IL, enrolling 1,279 students in grades 9-12 in 2024.","Enrollment is down 7% from 2021 to 2024.","It offers 21 AP courses, a course-rigor profile stronger than 90% of U.S. high schools, and has a dual-enrollment program (federal Civil Rights Data Collection).","661 students took the SAT or ACT in the most recent federal count, a participation level above 96% of U.S. high schools.","It has about 256 students per school counselor.","16% of its students were chronically absent in 2020.","Crystal Lake South High School had 50.5% of its Class of 2025, the seniors who graduated in June 2025, attending four-year colleges (Crystal Lake South High School 2025-2026 school profile).","Crystal Lake South High School had 84% of its AP exams in the 2025 exam year scoring 3 or higher, the seniors who graduated in June 2025 (Crystal Lake South High School 2025-2026 school profile).","Sources: National Center for Education Statistics (enrollment), the federal Civil Rights Data Collection and EDFacts, state education agencies where named, and the school's own published documents where named."],"caveats":["UC admits and applications are counted at each campus: a student admitted to three UCs counts three times. The UC Reach Score is those admits divided by the senior class, times 100, so a strong school scores above 100.","A published college list is the school's own document, copied as printed; counts are the school's, never ours, and an unnumbered list carries no counts.","Enrollment is NCES CCD for national pages and CDE for California pages; graduation and readiness measures are the state's or EDFacts' own definitions, named in each sentence.","Every figure here is also rendered on the HTML page it describes."],"chronic_absenteeism_pct":15.8,"city":"Crystal Lake","dual_enrollment":true,"enrollment":{"grades_9_12":1279,"year":2024},"enrollment_change_pct":-7.2,"enrollment_change_span":[2021,2024],"faq":[{"a":"Crystal Lake South High School offers 21 AP courses, a course-rigor profile stronger than 90% of U.S. high schools, and has a dual-enrollment program (federal Civil Rights Data Collection).","q":"How many AP courses does Crystal Lake South High School offer?"},{"a":"Crystal Lake South High School is a public high school in Crystal Lake, IL, enrolling 1,279 students in grades 9-12 in 2024.","q":"How many students attend Crystal Lake South High School?"}],"federal_grad_rate_pct":null,"feeder_standing":null,"name":"Crystal Lake South High School","nces_id":"171137001368","ok":true,"published_college_list":null,"sat_act_national_percentile":95.9,"sat_act_takers":661,"school_facts":[{"class_year":2025,"kind":"college_bound","method":"sweep:judged","quote":"4-Year College/University: 50.5%","retrieved":"2026-10-23","source_name":"Crystal Lake South High School 2025-2026 school profile","source_url":"https://resources.finalsite.net/images/v1757605938/d155org/utm664530clq1cagrrfe/25-26CLSSchoolProfile_1.pdf","text":"Crystal Lake South High School had 50.5% of its Class of 2025, the seniors who graduated in June 2025, attending four-year colleges (Crystal Lake South High School 2025-2026 school profile).","where":"page 2"},{"ap_pass_pct":84,"class_year":2025,"kind":"ap_pass","method":"sweep:judged","quote":"Percent 2025 AP\u00ae exams with a score of 3+ 84%","retrieved":"2026-10-23","source_name":"Crystal Lake South High School 2025-2026 school profile","source_url":"https://resources.finalsite.net/images/v1757605938/d155org/utm664530clq1cagrrfe/25-26CLSSchoolProfile_1.pdf","text":"Crystal Lake South High School had 84% of its AP exams in the 2025 exam year scoring 3 or higher, the seniors who graduated in June 2025 (Crystal Lake South High School 2025-2026 school profile).","where":"page 2"}],"school_type":"Public","slug":"crystal-lake-south-high-school","state":"IL","state_measures":{},"students_per_counselor":256,"url":"https://highschoolreach.com/school/crystal-lake-south-high-school"}