Proper prep starts with the real sources.
Everything below is free from the FAA. Read it in this order and the written stops being a mystery.
1
Private Pilot Airman Certification Standards
FAA-S-ACS-6C · Read first, skim it
The list of what the test and the checkride can ask. Use it as your map, not your textbook. Every Pilot Proper question maps to one of its codes.
2
Pilot's Handbook of Aeronautical Knowledge
FAA-H-8083-25 · Your main textbook
Aerodynamics, systems, weather, navigation, and decision-making in one book. Read it front to back once, then go back by topic as you practice.
3
FAR/AIM
14 CFR + Aeronautical Information Manual · Alongside the PHAK
The regulations (Parts 61 and 91 matter most) and the procedures manual. Look rules up when a question cites them rather than reading cover to cover.
4
Airplane Flying Handbook
FAA-H-8083-3 · With your flight lessons
How the maneuvers are flown. Lighter on the written, heavier on the checkride. Read the chapter before each lesson.
5
FAA sample test questions
Last, before you book
The FAA publishes sample questions so you can see the real format. Use them as a final format check once your practice scores are steady.
Links go to faa.gov and ecfr.gov. Pilot Proper is not affiliated with or endorsed by the FAA.
Every Pilot Proper explanation cites one of these.
So when an answer surprises you, you can check it at the source. See the ACS knowledge areas or the PAR exam guide.