* Test scores: Look at standardized test scores (like ACT/SAT) and graduation rates. These can be found on the Illinois Report Card website and the school's individual website.
* College acceptance rates: See what percentage of graduates go on to college and where they are accepted.
* Student reviews and feedback: Search for reviews from current and former students, though be aware that these can be subjective.
* Curriculum and extracurricular activities: Does the school offer a curriculum that meets your interests? Are there clubs and activities that appeal to you?
* School environment and safety: Consider the school's overall atmosphere and safety record. You might find information on school climate surveys or local news reports.
Without knowing the specific CICS school you're asking about, it's impossible to say whether it's a "good" school. Be sure to research the specific school you're considering using the factors above.