A revision site for student pilots sitting the IR(R) — Instrument Rating (Restricted) — written exam. The syllabus is condensed into short, focused notes and practice questions covering the ground you actually get tested on, so you can revise in short sessions instead of ploughing through a whole manual.
I built it after going through the rating myself and finding the existing study material either scattered or heavier than it needed to be. This keeps it simple: read the notes, drill the questions, walk into the exam knowing what to expect.
Free to use, and shared with other students working towards the rating.