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I suggest only studying for one at a time(801 & 802) Also go ahead and invest $10 in buying professor Messer's study guides for each of the exams. I tried reading different literature but it just got boring, so instead I mostly focused on doing any practice questions I could find and googling any questions I got wrong.
Practice Question sites:
http://www.examcompass.com/comptia/a-plus-certification/free-a-plus-practice-tests
http://www.davidlprowse.com/questions-bonus-220-801-220-802.php
Android app-https://play.google.com/store/apps/details?id=com.mazzam.APlusCertification801&hl=en