The FAA also just rolled out their 107 study guide. The FAA guide along with the $10 guide are excellent resources and probably all the info you will. If you are still having trouble with Sectional Charts, you can find YouTube videos and also printed guides for free. I had a hard time with the NAS "upside down" layer cake describing the different classes of airspace, but I have it down now. I am ready to PASS the test on Wednesday and only have to drive about 30min to the CATS site.