My wife did a very similar research project for her PhD (https://goo.gl/vSZ69s https://goo.gl/vSZ69s) They studied using the system in 5 groups (taking the sam

My wife did a very similar research project for her PhD (https://goo.gl/vSZ69s https://goo.gl/vSZ69s) They studied using the system in 5 groups (taking the same class) and got a statistically significant delta in the 3 experimental groups' scores vs. the 2 control groups. Both exp and ctl solved the same set of exercises, both worked with a teacher, but exp groups also used the system. The results about the learning deltas haven't been published yet, but you can e-mail her at <np at mathdip.org> if you're curious.