Despite the fact that the federal government only mandates standardized testing for 3rd grade and up, the Illinois State Board of Education wants to add K-2nd grade to the state standardized testing system via the new three-times-per year interim test they are proposing, which would look much like the NWEA MAP or other commercial through-year standardized tests.
This K-2nd testing would officially be optional, but the state would cover the cost for districts, and with the high-stakes of 3-8th grade testing, most districts would make use of it.
IL Families for Public Schools is circulating a petition, which you can find here.