I learn best when using the tests and games in your PDG software.

Wow!!!! The PDG and SKT software works. I increased my score 20+. McMillan, your system is 2nd to none.

I just wanted to say thank you for your guide. I scored higher than 98.88% of my peers. You have a great guide, and I recommend it to everyone that asks how I got such a high score. (PDG Advisor for SNCO)