I've read about this book online, and it seems to me like it's some kind of workbook for students. It's a workbook for building vocabulary, as far as I can tell; There's words for students to define, and they can look up the actual definitons. At the end of each section there's SAT, ACT, GED, and SSAT drills and quizzes, and u will supposedly also learn synonyms, Latin words and memorization tools throughout the workbook. (I'm saying supposedly, just to be on the veilig side, since I personally hasn't seen of read the book) The words, task and kwissen are Twilight related. u can read about Defining Twilight on
link and read a sample on
link.
I hope this helped :)