Air Law and ATC Procedures
Air law questions reward precision about who may do what, where, and under which conditions. Anchor your revision on the ICAO Annex structure (Annex 1 Licensing, Annex 2 Rules of the Air, Annex 6 Operations, Annex 8 Airworthiness, Annex 10 Communications/Navigation/Surveillance, Annex 11 ATS, Annex 14 Aerodromes) and on the Omani CARs that implement them, since the national regulation usually mirrors ICAO but may add stricter requirements.
Key concepts: rules of the air (right-of-way, cruising levels, VMC minima by airspace class), clearance limits and read-back requirements, ATC separation responsibility versus pilot responsibility for terrain avoidance and collision avoidance, licence validity and recency, aircraft documentation carried on board, and notification procedures (flight plans, position reporting, emergencies and unlawful interference).
Common traps: confusing semicircular cruising levels with quadrantal levels; assuming ATC provides terrain clearance in all airspace; mixing transition altitude (fixed, charted) with transition level (variable, from the ATIS); and forgetting that a clearance does not authorise deviation from the rules of the air. Another frequent trap is treating ICAO Standards as optional - states file differences, so a question about "standard" practice expects the ICAO baseline.
Worked example: an aircraft on a magnetic track of 075° at FL 200. Above the transition level, tracks 000–179° use odd flight levels, so the correct level is FL 210 (not FL 200, which is for tracks 180–359°). Rule of thumb: east odd, west even - and always check whether the question says magnetic track or true track, and whether the level is above or below the transition altitude.