Reddit mentions of Private Pilot Oral Exam Guide: The comprehensive guide to prepare you for the FAA checkride (Oral Exam Guide Series)

This is what I used for my written and it worked just fine.

This is what I used for my oral and it worked just fine.

This is how I would advise you to study for your oral.

100% this! I used the ASA guide by Mike Hayes. Link to amazon here. Go through that whole thing cover to cover. Get someone else to ask you the questions if you can.

• Federal Aviation Regulations / Aeronautical Information Manual
  
• Pilot's Handbook of Aeronautical Knowledge
  
• Airplane Flying Handbook
  
• Private Pilot Airplane Airmen Certification Standards
  
• Private Pilot Oral Exam Guide
  
  Keep in mind all the information you need to pass is available for free from the FAA. But I like having the books and in the grand scheme of things they're really cheap. The FARs are the regulations you need to know, mostly parts 61 and 91. The AIM has a ton of good information in it as well. All stuff that could show up on your written exam. The PHAK is going to be where a lot of your written material comes from. If you know the information in there forwards and backwards you'll do great.
  
  The ACS is the practical standards to which you'll be judged on the check ride. How close do you need to hold altitude? How close do you need to hold that 45 degree bank angle? All found in the ACS.
  
  The Oral Exam Guide's usefulness will vary based on who gives you your checkride. My DPE literally flipped through his copy of one and picked a few questions out of each section to ask me. If I messed up he stayed in that section longer. If I answered a handful near perfectly that section was done.

Pretty prepared honestly. If you don't understand something in the ACS, chances are it will be what comes up. I read this book and I think it was super helpful. https://www.amazon.com/Private-Pilot-Oral-Exam-Guide/dp/1619544598

I'm in the same boat as you right now. I bought the ASA Private Pilot Oral Exam Guide: https://www.amazon.com/gp/product/1619544598/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

I've been having my girlfriend read the questions to me as if she were the examiner and it's been very helpful.

I used this: https://www.amazon.com/dp/1619544598/ref=cm_sw_r_cp_apa_L8DNAbTCRX32Z

The layout is great, and a non-pilot friend can pick it up and ask questions and let you know if you're right. If you've done your written and studied what you should, this is pretty much all you'll need to be ready.