All 13 ATPL subjects, ranked by difficulty

General Navigation is the subject that most frequently causes students to need a re-sit or to run short of sittings. The flight computer (CRP-5 or equivalent) needs to be second nature before you enter the exam room. Do not start full mocks until you can use it without thinking about the mechanics. The syllabus is also genuinely broad, covering celestial navigation concepts that require careful study even if they appear infrequently.

Performance ranks second not because the underlying theory is as broad as General Navigation, but because the exam places very specific demands on chart-reading accuracy. A student who understands all the theory but has not spent enough time drilling chart interpretation will lose marks consistently. Pair Performance study with Principles of Flight, as the aerodynamic foundations inform each other.

Most students find Flight Planning easier once General Navigation is well established, since the fuel and navigation calculations use the same tools. Study it after, or concurrently with, General Navigation and Performance. The ICAO flight plan form is a topic many students underestimate: it appears in the exam with specific questions about field formats and requirements that need dedicated study time.

AGK sits at number four because the sheer volume of technical systems content makes it one of the most time-intensive subjects to prepare. Study it concurrently with Instrumentation: the two subjects share significant content on aircraft sensors, avionics, and system components. Covering shared content once and then applying it in both question banks is significantly more efficient than studying each subject in isolation.

Instrumentation is the natural companion to AGK, and most students find it easier once AGK systems content is established. The altimetry and compass error sections are the areas that most consistently produce wrong answers, even from students who feel they understand the material. Revisit these sections with question bank practice more than once to ensure the distinctions are solid.

Meteorology is one of the most content-rich subjects in the non-calculation category. Students who underestimate it because it lacks maths tend to score in the low 80s on mocks when they expect to score in the high 80s. METAR and TAF decoding, cloud types, and icing mechanisms are all well-represented in the exam. Treat it with the same rigour as the technical subjects.

Radio Navigation sits at number seven because its difficulty is bounded by its syllabus size. Once the core systems are well understood, the question bank rewards that understanding consistently. The ILS section typically requires the most revision time, as error interpretation questions require spatial reasoning that takes practice to become reliable.

Principles of Flight is a subject where the difficulty is concentrated in specific areas rather than spread across the whole syllabus. Basic aerofoil and lift/drag theory is accessible. Compressibility effects and high-speed aerodynamics require more careful study. Pair this subject with Performance to exploit the shared aerodynamic foundations in both syllabi.

Air Law sits in the medium category despite being essentially recall-based, because the volume of specific regulatory detail that needs to be memorised accurately is substantial. The question bank for Air Law is also one of the more strictly worded: knowing the concept is often not enough if you cannot recall the specific value or exception the question is testing.

Operational Procedures is a manageable subject with a focused syllabus. Emergency procedures, dangerous goods classifications, and low-visibility operations are the sections that warrant the most attention. This subject pairs well with Air Law and Meteorology in a study phase, as all three are recall-based and can be rotated through efficiently.

Human Performance is one of the most accessible ATPL subjects in terms of content volume, but students occasionally find the question phrasing more subtle than expected. Because the material is based on research and models rather than hard technical facts, questions sometimes test your understanding of the specific framework being described. Familiarity with the question bank is particularly valuable here.

Mass and Balance is one of the best subjects to tackle early in your ATPL preparation. The syllabus is focused, the calculations are straightforward once the method is understood, and passing it early gives you a banked subject and a confidence foundation for the harder calculation work ahead. It is a good introduction to the exam format before the difficulty escalates.

Communications is the easiest ATPL subject by a clear margin. The syllabus is short, there are no calculations, and the question bank is one of the smallest in the ECQB. Most students pass comfortably with focused study over four to six weeks. Sit it in your first sitting to bank an early pass and establish your exam routine before the harder subjects arrive.