For educators, the "answers" provided by students are captured in a Learner Management System (LMS) . Teachers can monitor:

Xreading is an extensive graded-reading platform designed to improve learners’ reading fluency, vocabulary, and comprehension through sustained, level-appropriate practice. This paper examines Xreading’s pedagogical foundation, features, effectiveness, user experience, limitations, and recommendations for educators and researchers.

Choose books where you understand about 95% of the words. If you are constantly guessing, the quiz will be difficult. Check the Word Count:

Here is the truth: