There are several companies that provide video-based learning - basically creating the feel of a personal tutor by your side. Videos tend to be better for visual and auditory learners because you can see and here a GMAT expert teach you a lesson or go through an explanation. But videos aren't for everyone, it just depends on your learning style. See the examples below for a better sense of video-based GMAT prep.
An example math video lesson from Magoosh
An example of practice question with a video explanation:Geometry Question
We also have similar lessons and questions for Verbal.
I hope that helps!
Magoosh Test Prep