Both the ISEE and the SSAT are offered on multiple dates throughout the fall and early winter. The SSAT is offered on only one test date per month from October through February, while the ISEE is generally offered two or three times per month during the same time period. You should generally allow one to three months for the preparation process, depending on diagnostic results, admissions goals, and scheduling availability, as well as on whether your student is preparing for one or both exams.