These are some useful links as you prepare for your FAA Practical Test.
FAA Handbooks
Pilot’s Handbook of Aeronautical Knowledge (PHAK)
Instrument Procedures Handbook
Aeronautical Information Manual
Airman Certification Standards (ACS)
Commercial Pilot – Airplane ACS
Practical Test Standards (PTS)
Flight Instructor – Airplane PTS
Flight Instructor – Instrument PTS
Federal Aviation Regulations (FARs)
Part 61 – Certification: Pilots, Flights Instructors, and Ground Instructors
Part 91 – General Operating and Flight Rules
Advisory Circulars
AC 61-65H: Certification: Pilots and Flight and Ground Instructors
AC 61-142: Sharing Aircraft Operating Expenses
AC 91-92: Pilot’s Guide to a Preflight Briefing