I know I had read somewhere that there is no real difference, and I appreciate your honesty and commitment to the students. (Another major prep company told me that the 2015 editions I had should be upgraded. I still can’t find a difference. (Rhymes with sour-score)
Anyways, I ordered a new copy from Amazon Prime. I bought this book used, and realized it has some of the drills already answered. Also, I really want to support the awesome book and its equally awesome author.
Thank you for all you help.