I was co-founder of TestGenie, a web/android app for Indian Test Prep Market (http://www.testgenie.com). TestGenie was a platform for MBA Preparation and Computer Based Testing. TestGenie provided the effective technology tools to compete in the current education system and customizing contents as per students individuality and requirements.
We worked on algorithms to personalize and improve results for students. Deployed solution on AWS cloud and 40,000 students were using it at one time.
You can see demo at http://tg.svtechie.com.