The Extended Essay has a 4,000-word limit and is graded A to E. Together with Theory of Knowledge it can add up to three points to your diploma score.
Narrow it down
A good research question is specific enough to answer in 4,000 words with evidence you can actually get. If your question needs a book to answer, narrow it.
Use your reflections
Your reflection sessions with your supervisor are assessed. Keep notes after each meeting so the reflections show how your thinking changed.