When you get a question wrong, don't just look at the correct letter. Mark it, go back to the question, and try to figure out why the correct answer is what it is.

Complete an entire unit before looking at the key. Checking answer-by-answer prevents your brain from actually learning the logic.

Identify whether your mistakes are due to a lack of knowledge or simple carelessness.

If you notice you are consistently getting "Gerund & Infinitives" questions wrong, you know exactly where to refocus your study hours.

Check the official ELS Yayınları website or contact their support if you are a registered student.