How frequently are practice tests conducted in the book?

The correct answer highlights that practice tests are designed to reinforce the material learned and assess understanding at critical points in the learning process. By placing these tests at the end of each unit, students are given the opportunity to review and consolidate their knowledge immediately following their engagement with the content. This timing ensures that the information is still fresh in their minds, allowing for effective recall and application of what they have just studied.

Conducting practice tests at the end of each unit also helps to identify areas where students may need additional support or further review before moving on to subsequent material. This structured approach to assessment fosters a deeper understanding of the subject matter and encourages ongoing learning and improvement.

In contrast, having practice tests at the beginning of each unit or only after completing the book would not provide the same level of immediate feedback and reinforcement. Furthermore, conducting tests every few months could lead to gaps in knowledge retention and might not effectively address the immediate learning needs of students after each unit.