ISEE (Independent School Entrance Exam) testing is typically given over 3 seasons and students interested in Chicago independent schools for lower, middle or upper grades may need to take these tests as part of the application criteria. If so, remember that a student can take the ISEE once per season.

From the link:

https://www.erblearn.org/parents/isee-overview#testing-seasons

“Students may register to take the ISEE up to three times in a 12-month admission cycle, once in any or all of three testing seasons. The seasons are Fall (August–November), Winter (December–March), and Spring/Summer (April–July).”