Each lecture includes (1) Basic skills with examples, and (2) Exercises with answer keys.
Solutions to all practice problems can be found here:
http://www.amazon.com/Lectures-Mathcounts-Competitions-Solution-Manual/dp/1530806534
Training class is offered: http://www.mymathcounts.com/Copied-2014-Summer-Mathcounts-Training-Program.php
Jane Chen is the author of the book "The Most Challenging MATHCOUNTS® Problems Solved"- 2000-2010 National Mathcounts Solutions" published by Mathcount.org. Her other publications include: Twenty Problems Solving Skills. Twenty more Problems Solving Skills. Eleven Years Mathcounts State Problems Solutions. 50 Lectures for American Math Competitions.