Use it to support active practice rather than only giving you more material to read. You can ask for questions based on a trusted passage, try answering without looking, and then compare your explanation with the original information.
Check any generated questions and feedback, especially when accuracy matters. If the assistant marks an answer wrong, ask which part of the source supports that judgment. Finish by explaining the concept in your own words. The useful outcome is what you can understand and recall, not how much text the tool produces.