The Illinois State Board of Education (ISBE) said 7.2 percent of Proviso East High School's (PEHS) 2015 senior class was "college ready."
The state average for college readiness in 2015 was 46 percent. Northside College Preparatory High School (98.1 percent) had the highest college readiness rate in the state. Robeson High School (zero percent) had the lowest.
All students who score a 21 on the ACT qualify as "college ready."
"(This score) shows that students have learned important academic skills that they will need in order to succeed in college and careers," ISBE wrote in its analysis. "While academic preparation is an essential part of readiness for college and careers, students also need persistence, motivation, time management and technical skills."
PEHS students did better on reading (8.1 percent) and English (22.8 percent), and worse on science (5.3) and math (6.4).
Only 1.4 percent of PEHS students were college ready in all four subjects, ISBE said.
The 2015 state average was 25 percent.
Among high schools in Cook County, Class of 2015 college-readiness rates at Proviso Math and Science Academy (74.6 percent) and Proviso West High School (14.4 percent) were all higher than at PEHS. Enrollment at PEHS in 2015 was 1,753; 654 students (37.31 percent) were freshmen; 322 (18.37 percent) were seniors.