Criteria to Consider:
Google around: Are there book lists published on educator blogs that you can use? Professional organizations will often publish various lists as well.
Search the library catalog to see what books are out there that might work well for a book review. You can search broad categories, such transgender youth AND education, Educational reform and second language learners, etc...)
Your instructor suggested a few journal titles in your field that publish book reviews (see below for instructions on how to filter for book reviews):