The ISBE said 29.3 percent of Union Elementary School students taking the Partnership for Assessment of Readiness for College and Careers (PARCC) exam in 2016 passed, in comparison to the 32.3 percent passage rate in 2015.
Meanwhile, the school posted an average spending rate of $21,850 per pupil, above the state's average of $12,821.
The PARCC test is a state-mandated exam used to assess the school and student performance in several states nationwide.
The following table lists passage rates of area elementary schools.