Commercial Eligibility Requirements.
What is 61.123?
Flight Review and Currency Requirements (these two regulations).
What is 61.56 and 61.57?
Minimum Equipment Lists, Inop Equipment, and "ATAPER PDL".
What is 91.213?
VFR Cruising Altitudes.
What is 91.159?
Describes the various types of NOTAMs.
What is AIM 5-1-3?
Look here to see a detailed list of the required aeronautical experience needed within the 250 hours of total flight time necessary to take the Commercial Checkride.
What is 61.129?
Basic VFR Weather Minimums.
What is 91.155?
Can be remembered by the acronym "EFIG" to memorize the regulation for endorsements.
What is 61.31?
IFR Cruising Altitudes.
What is 91.179?
Special Use Airspace.
What is AIM 3-4-1?
This one talks about the privileges and limitations for commercial pilots, including definitions such as common carriage, private carriage, and wet and dry leases.
What is 61.133?
Required pre-flight duties and responsibilities of the PIC before each flight.
What is 91.103?
Types of TFRs can be remembered by the acronym "VANSS" and found in these two regulations.
What is 91.137 and 91.145?
Aeronautical knowledge areas that must be known to pass the knowledge test are in this regulation.
What is 61.125?
Aeromedical factors can be found primarily in these two places.
What is AIM 8-1-2 and PHAK Chapter 17?
These two regulations both state that you must carry your Government Photo ID, Pilot Certificate, and Medical with you onboard the aircraft when acting as PIC.
What is 61.3 and 91.3?
Oxygen Requirements for crews and passengers at altitudes above 12,500 and on.
What is 91.211?
"ATOMATOFLAMES", "FLAPS", and "GRABCARD".
What is 91.205?
Required areas of operations that must be known to pass the practical test are found in this regulation.
What is 61.127?
Significant Weather, such as AIRMETs and SIGMETs, can be found here.
What is AIM 7-1-6?
Outlines the various classes of medicals and how long each is good for based on age.
What is 61.23?
Required Documents onboard the aircraft.
What is 91.203?
Right-of-Way Rules, AKA "BGAAR."
What is 91.113?
These two regulations talk about drugs.
What is 61.53 and 91.17?
Information on Pressurized Cabins can be found here.
What is PHAK Chapter 7?