Here given below is the list of some best GMAT prep classes in Chicago, yo can join any of the class for the preparation

DePaul University Continuing and Professional Education (CPE)
14 E Jackson Blvd, Chicago, IL 60604,
United States

Veritas Prep
1710 Orrington Ave, Evanston, IL 60201, United States

Manhattan Elite Prep Chicago: GMAT GRE TOEFL SAT LSAT & Admissions
Hickory Hills, IL, United States

Manhattan Review
Chicago, IL, United States

The Princeton Review
2801 N Sheffield Ave, Chicago, IL 60657,
United States

Kaplan Test Prep
2828 N Clark St #415, Chicago, IL 60626,
United States

Northeastern Illinois University
5500 N St Louis Ave, Chicago, IL 60625,
United States

Kaplan University
550 W Van Buren St, Chicago, IL 60607,
United States

Loyola University Chicago
1032 W Sheridan Rd, Chicago, IL 60660,
United States

MyGuru LLC
600 N Kingsbury St, Chicago, IL 60654,
United States