It appears the question pool changed in June 2015 for the General class license. Thus, the 8th edition ARRL General Class Study Guide was published, and the cover indicates it is good through 2019. 7th edition books are much cheaper, since they are "obsolete." Should I go ahead and pay for the 8th edition, or will the 7th edition cover most of the material? If yes, is there an online question pool that would better gauge my preparedness for the 8th edition test? Thank you for your assistance.