Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best book if you have to prepare on your own

Before applying for citizenship, I bought three books from Amazon. I found this one by far the most comprehensive. The author, an immigration lawyer, covers every aspect of the procedure, including helpful sample letters, tips, exam preparation strategy, and when to consult a lawyer. A tip: get the latest edition, because the test has changed recently. My only criticism would be that someone with limited English might have trouble understanding some of it. Other guides focus more on the English and civics test, though this book provides all you need to know, presented in orderly fashion.