ORION is the single best tool I used to prepare to take the GMAT for the second time. I went from a 640 to a 710 in roughly two months! Studying with ORION felt like playing a game - you move from level to leven on different topics, and each level includes a 6-10 minute video and several questions that adapt in difficulty as you improve. Explanations are SO CLEAR and TO THE POINT, that on Test Day, I didn´t even have to read the entire Answer Choices for Sentence Correction questions. I would definitely recommend it to anyone, given that my confidence level significantly improved, as well as my performance, in only two months.