Writing a book review if often assigned as a term paper. Given that a book can be long to read, many professors will assign book review assignments to not only make you read and evaluate the book but to also force you to connect the book you are writing your review on to the course material. Because writing a book review means that you must critically examine the book using the course material, your book review will be graded on a combination of your mastery of the book, in terms of your understanding of it, and your ability to apply class materials to the book so as to engage critically with it.
In writing a book review, you will sometimes be asked to simply review the book based on analysis and interpretation of the text itself and will sometimes be asked to review the book by including external sources that either agree or disagree with the argument being made in the book. Regardless of which approach to writing a book review you are asked to use; the end goal is the same. Your book review must be based on a thesis which engages with a core element of the book, and you must support your thesis or argument using either interpretation and analysis of the book, external sources, or both.
Ultimately, writing a book review is like writing an essay or research paper in that you will develop a thesis and supporting paragraphs elaborating on your position regarding the book. This said, and unless you have been asked to incorporate external sources, your sole focus in writing a book review will be to critically engage with the book assigned to you. This means that in writing a book review, you must have a mastery of what has been taught to you in the class whether it was via lectures or via mandatory readings. Integrating these as you write your book review on the basis of critical thinking is critical for obtaining a top grade for your book review assignment.