What is the best English testing strategy for applying to the University of Chicago?

For the University of Chicago, the best strategy is to treat English testing as a requirement only if it applies to your background, not as a score you submit just to strengthen your application.

So the first step is to check whether you would actually be considered an applicant who needs to prove English proficiency. In practice, this usually matters most for international applicants or students studying in non-English-medium schools. If your schooling has been in English, an extra English exam often adds little or nothing.

If UChicago would require proof of English proficiency in your case, then the smartest approach is usually to submit one solid qualifying score rather than over-investing in trying to maximize it far beyond the minimum expected level. These tests are generally used to confirm readiness to study in English, not as a major distinguishing factor in admissions once you are clearly proficient.

If English testing is optional for you, I would not make it a major priority just for UChicago. For this school, your transcript, course rigor, essays, recommendations, and overall academic profile will matter much more. UChicago especially pays close attention to writing quality in the application, so strong essays can do more to show advanced English ability than an extra proficiency test if one is not required.

A practical strategy is this: confirm whether your school’s language of instruction makes you exempt, and only plan for TOEFL, IELTS, or Duolingo if UChicago says you need one. If you are exempt, put your time into the parts of the application UChicago weighs more heavily, especially your essays and academic preparation.