Magoosh Premium - Excellent!

Magoosh explains all the concepts very well. And most of the videos are around 10 minutes long. In addition, after you attempt a question, Magoosh will suggest lessons that relate to that question so you can see exactly where you went wrong.

The dashboard is another excellent feature. It gives you statistics such as percentage of questions correct, average time you take to answer questions against the time others have taken.

In addition, Mike and his time are excellent at answering your questions if you email them. Not only do they provide the correct answers and methodology but they also tell you exactly where you are going wrong fundamentally.