How This Site Works
CDL Drill & Review is designed around a short-loop study method. Instead of burying the learner in a large portal, it moves through a small number of focused steps.
Step 1: Start with a short session
You can begin with mixed practice if you need a broad signal, or use topic drill if you already know which area is unstable. Each session is intentionally short so the result stays legible and the review step stays actionable.
Step 2: Read the result, not just the score
The result page is meant to do more than show a number. It identifies the current band, summarises missed items, and highlights repeated weakness clusters when they exist. This is where a user should decide whether to go broad again or narrow into repair.
Step 3: Repair only what broke
The review page deliberately avoids showing the whole question bank again. It focuses only on the missed items from the last session, because targeted correction is more useful than re-reading material that did not fail.
Step 4: Use topic drill when the pattern repeats
If the same topic cluster keeps appearing in weak-topic output, topic drill becomes the more efficient route. Instead of hoping random practice eventually fixes the problem, topic drill puts pressure directly on the unstable area.
Step 5: Repeat with intention
The point of repetition here is not volume for its own sake. It is to see whether the same weakness cluster survives another short session after repair. When the site is used correctly, each new round gives a clearer signal than a giant content portal full of unrelated pages.