From my own experience, choosing my own books for my report has always backfired on me. I always chose books I wanted to read, and the teacher would have us spend months annotating texts, making claims about characters and other figures in the book. I heavily regretted this decision, because whenever I read a book I have some interest in. I take my own pace, and think in my own way of thinking instead of what the school teaches you. I do it for my own pleasure, and I absorb what I usually notice in books. Most kids these days would pick books that they have much interest in, and are forced to read it in another way than they usually do. If your teacher or instructor picked the book, they would most likely pick a book that demonstrates the techniques they want to teach you. And the book would be easier to annotate and help you get a better grade in that class. After all, school is meant for learning.