What the paper isA hundred questions, and the clock is real
Navigation is set as 100 questions at 1 mark each in 3 hours — about 108 seconds a question, and a meaningful share of them are numericals you cannot do in your head. That is the whole difficulty of this paper. Candidates who know the method still fail it by spending four minutes on a triangle of velocities and running out of paper.
Sitting it on the clock is therefore not optional practice; it is the only way to find out whether your method is fast enough, and it is what a chapter-by-chapter drill can never tell you.
How the paper is builtFrom all 176 chapters, every time
The 100 questions are drawn at random from all 7,751 in the bank — the largest of the five — across general navigation, flight instruments, radio navigation and performance. No fixed sample paper, so a second sitting is a second paper.
Because the draw follows the shape of the bank, the mix of theory and numericals in a mock lands close to the mix in a real sitting rather than being decided by whoever wrote the sample.
Where marks go missingUnits, signs and mean latitude
The common losses are not conceptual: minutes read as degrees, an east–west change of longitude signed the wrong way, departure computed at the wrong latitude, TAS used where groundspeed was wanted.
Every question carries its chapter, so a submitted paper says which of those it was. 245 of the 1,847 navigation numericals carry a full worked solution with the formula spelled out, and the rest carry the resolved answer key while those solutions are written.
How to use itChapter first, paper second
A full paper sat before the methods are automatic mostly measures how slow you are. Drill the chapter in practice mode until the working is quick, switch it to test mode — only test and exam answers move the readiness estimate — and sit the full 100-question paper when several chapters hold.
Then sit it again a week later. The readiness engine reports a range and tells you when it has too little evidence, which is what stops one good afternoon reading as "ready".