From the Wisconsin DPI website:
The Wisconsin High School Assessments are comprised of:
9th and 10th grade students take the ACT Aspire in the spring of each school year. 11th grade students take the ACT Plus Writing during the spring of their junior school year. The ACT WorkKeys assessment is now optional.
Many students take the ACT numerous times in order to increase their scores for admission to 4-year colleges. For more information on how to register for an upcoming ACT test, please visit: https://www.act.org/