The ACT is the most popular test nationally and internationally. All colleges accept the ACT. Not all colleges are accepting the new SAT next fall due to the fact that the new SAT (debuted in March of 2016) was made a lot easier and aligned with Common Core. Make sure you protect your student.
As of today, Illinois will not be able to offer a "free" SAT or ACT during the spring of 2018 due to a lack of funds and the elimination of Common Core which required states to use a test to measure schools.