Air Law and ATC Procedures
The regulatory framework
A candidate must know the hierarchy of rules: the ICAO Annexes set the international standard, the state's implementing regulation (for example an EU regulation or a national aviation act) gives it legal force, and the operations manual translates it into company procedure. Know the difference between standards (binding) and recommended practices (aspirational). Learn the definitions that examiners love: the categories of airspace and their services, VMC minima by altitude band and airspace class, the meaning of "ceiling", "visibility" and "flight visibility", and the rules on right of way, lights, and minimum safe altitudes.
ATC procedures and clearances
Understand the clearance as an instruction with limits: a clearance is not authority to breach a regulation, and a pilot must read back safety-critical items (route, altitude, heading, frequency, speed, runway). Learn the phraseology for conditional clearances, line-up, take-off, landing, and the meaning of "expect", "hold short", "immediately" and "expedite". Know the categories of separation responsibility and when a pilot may deviate from a clearance (traffic avoidance, emergency, TCAS resolution advisory).
Traps
The most common traps are VMC minima that change with altitude and class, airspace that requires a clearance versus only radio contact, and the difference between controlled and advisory services. Another classic is confusing sunset/evening rules with day/night definitions, and mixing up the validity periods of medical certificates and ratings.
Worked example
A VFR flight at 4,500 ft in Class D airspace: the pilot needs an ATC clearance (not just radio contact), must remain clear of cloud and in sight of the surface with the applicable visibility, and must respect the speed limit below 10,000 ft. Rule of thumb: if the class letter is A to E, assume you need a clearance unless the chart or AIP says otherwise.