Completing Amplifire increases bar exam scores by 13 points.
Most studies of test-prep programs suffer from selection issues because students often choose only one test-prep solution. These studies also struggle with the issue of correlation versus causation; a student who chooses to do more voluntary test-prep might score better simply because they are a better student—not because the test-prep program itself was of any value.
A 2017 study evaluated the effect of Amplifire on simulated bar exam scores, but avoided these two problems by comparing performance across exam topics within each learner. Topics on which a student used Amplifire were compared to topics on which that same student didn’t. This study thus controlled for most third-variable issues that undermine causality (e.g., student ability, motivation, study habits).
The study found that students’ relative scores increased on topics for which they relied on Amplifire. The increase, extended to all topics covered on the bar exam, results in a net gain of 13 points due exclusively to Amplifire.