Score 50 Points Higher on the GMAT or Your Money Back - Knewton Test Prep
http://www.knewton.com/

Knewton has developed the industry’s first adaptive learning engine, customizing educational content to meet the needs of each student. Whereas traditional classrooms and textbooks provide the same material to every student, Knewton dynamically addresses your performance at the atomic concept level.

Live online GMAT, LSAT, GRE, SAT prep courses customized to each student, powered by adaptive learning engine. Access free practice test, sample questions. Raise your score, target top grad schools.

Good idea, interesting implementation