Update README.md

README.md

@@ -20,6 +20,35 @@ the catalog's `class` field. A class-A candidate who wants every
 Technische question imports all three Technische decks. Re-importing
 a newer build preserves your review history.
 
+## Exam sections
+
+The BNetzA exam has three parts (*Prüfungsteile*): two shared across
+all license classes plus the technical part, which is split per
+license tier. The question ID's first letter encodes which part it
+belongs to:
+
+**Non-technical (one deck each, taken by every candidate):**
+
+| Section                        | ID prefix | Questions |
+|--------------------------------|-----------|----------:|
+| Betriebliche Kenntnisse        | `B*`      |       172 |
+| Kenntnisse von Vorschriften    | `V*`      |       204 |
+
+**Technical (one deck per license class):**
+
+| Class | Section name              | ID prefix | Questions |
+|-------|---------------------------|-----------|----------:|
+| N     | Technische Kenntnisse (N) | `N*`      |       195 |
+| E     | Technische Kenntnisse (E) | `E*`      |       463 |
+| A     | Technische Kenntnisse (A) | `A*`      |       716 |
+
+Counts are from the current edition (3. Auflage, März 2024; ~1750
+questions total). The license tiers are cumulative for the exam:
+a class-E candidate is responsible for `N*` + `E*` + `B*` + `V*`;
+a class-A candidate is responsible for everything. Filter inside
+Anki by deck, by the `klasse-N|E|A` tag, or by the `Number` field
+prefix.
+
 ## Exam question source
 
 The catalog is published by the Bundesnetzagentur (BNetzA), the German
@@ -41,10 +70,15 @@ header.
 
 ## See also
 
-[**50ohm.de**](https://50ohm.de/) is an excellent companion learning
+- [**50ohm.de**](https://50ohm.de/) — community-maintained
-resource for the same exam — community-maintained explanations,
+  explanations, worked examples, and study material for the same
-worked examples, and study material that complement the bare
+  exam. Pairs well with these decks for the *why* behind each
-question catalog the decks built here are based on.
+  question.
+- [**DARC**](https://www.darc.de/) — Deutscher Amateur-Radio-Club,
+  the German national IARU member-society. Publishes the German
+  band plan, regulatory liaison material, and a large body of
+  technical and operating guidance referenced throughout the
+  amateur-radio community.
 
 ## Requirements