A. Check for app updates regularly. Developers often add new content and questions in updates. Go to the App Store, search for CDL Prep, and see if an update is available. If so, download it to ensure you have the latest version with the most questions.
B. Supplement your study with official DMV materials. Visit your state's DMV website to access the official handbook and practice tests. This will help you cover any gaps in the app's content.