Would be way cooler to assign 2-3 different books and request a critical analysis of competing themes. Or pick you own book, get it approved by the teacher, and analyze that. But some of that is probably too much for younger students

In my high school English we used a 2-volume “anthology” of American lit that had entire books and short stories but was mostly very long excerpts of maybe a couple hundred novels/stories/poems, and we took a comparative approach. Most of us had already read all the top 25 classics (gatsby, Harper Lee, Salinger, grapes of wrath etc) by the time we got to that class though