This Free version only has 30 basic questions to show you the general view of the app. The full ExamGuider version includes more than 1000 questions that cover the whole sections of AWS- CWI exams. You only need to make an one time payment of $15.99 to download and use the app forever. It works offline so you can use it everywhere, everytime without an available Internet
So its time to download and practice.
Good luck with your exam!