UIC, the University of Illinois at Chicago has selective admissions -- roughly one out of every three applicants will not get in. Admitted students tend to have solid grades and standardized test scores. In the scattergram above, the blue and green represent accepted students, and most of them had a high school average of B or higher, an ACT composite score of 19 or higher, and a combined SAT score (CR+M+W) of above about 1400. Somewhat higher numbers increase your chances significantly.
Throughout the graph, however, you'll find a bit of red (rejected students) and yellow (waitlisted students) mixed in with the blue and green. Some students with grades and test scores that were on target for UIC did not get in. At the same time, a number of students were accepted with test scores and grades below the norm. This is because UIC has holistic admissions -- the admissions officers are evaluating students based on qualitative as well as quantitative information. A rigorous high school curriculum, winning personal statement, and interesting extracurricular activities all contribute to a winning application.
To learn more about the University of Illinois at Chicago, high school GPAs, SAT scores and ACT scores, these articles can help: