Reddit mentions of Private Pilot Test Prep 2014: Study & Prepare (Test Prep series)

All 3 in one picture

Buy this book immediately: http://www.amazon.com/Pilots-Handbook-Aeronautical-Knowledge-FAA-H-8083-25A/dp/1619540207/ref=pd_sim_b_7. It pretty much has everything you want to know about all aspects of flight. Great continuous, repeated read.

After you're flying for a bit, right around when you're at solo status (either pre or post XC), you'll want to get this book: http://www.amazon.com/Visualized-Flight-Maneuvers-Handbook-Handbooks/dp/1560275219/ref=pd_sim_b_48. For your PPL license you'll need to demonstrate a number of maneuvers with proficency, and this is a great reference for all of them.

When you're studying for your PPL written, grab this book:http://www.amazon.com/Private-Pilot-Test-Prep-2014/dp/1560279788/ref=pd_sim_b_23. Helped me a ton.

When you're getting ready for your checkride, get this book: http://www.amazon.com/gp/product/1560279494/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1.

Also, get an iPad and Foreflight. While you'll hear a ton from pilots about getting started too early with electronics during your training, the main thing to steer clear of is using it for in-flight navigation and relying on it for GPS. You have to learn dead reckoning, pilotage and old(er) school navigation like VORs. It's great for flight planning and the digital charts are incredible but I still plan out my flights using a paper flight plan. Also, it has a documents section that's just fantastic for downloading good FAA reads like the FAR/AIM, your aircraft's POH and a ton of other downloadable documents.

Love to hear some other suggestions.

As mentioned, I would start by reading some FAA publications (assuming it's an FAA certificate you're going for):

PHAK - Pilot's Handbook of Aeronautical Knowledge - http://www.faa.gov/regulations_policies/handbooks_manuals/aviation/pilot_handbook/

Aeronautical Information Manual - http://www.faa.gov/air_traffic/publications/media/AIM_Basic_4-03-14.pdf

You should also read through 14CFR sections 61 and 91:
http://www.ecfr.gov/cgi-bin/retrieveECFR?gp&SID=257acc4699ee7253af775fc7e9492e51&r=PART&n=14y2.0.1.1.2

http://www.ecfr.gov/cgi-bin/retrieveECFR?gp=&SID=257acc4699ee7253af775fc7e9492e51&r=PART&n=14y2.0.1.3.10

All of this information is free, and covers around 95% of what will be on the FAA private pilot written exam.

If you're getting close to test time, I also highly recommend a test prep book (I used: http://www.amazon.com/Private-Pilot-Test-Prep-2014/dp/1560279788 ) as these contain almost all of the questions you could find on the exam, as well as explanations for the correct and incorrect answers.

Good luck!