LSAT

Law School Admissions Test, LSAT.

SAMPLE QUESTIONS
Here is a review of sufficient reasoning presented by Salman Khan.  

He does a decent job.  

And this gal who works for the Khan Academy also does a decent job of showing the process of elimination on reasoning questions.

PREP GUIDES
You probably can’t go wrong with any of these, but here is one with 5-star reviews.

Mike Kim looks like he is getting the most views on YouTube.

ONLINE COURSES
This page lists AND ranks the different online courses.  It offers more than 12 different categories to rank different programs.