Agreed. If there are 100 problems in a book and I work all 100, how am I to know if I did it right? If I get one wrong (which I assuredly will), how am I to see

Agreed. If there are 100 problems in a book and I work all 100, how am I to know if I did it right? If I get one wrong (which I assuredly will), how am I to see what I did wrong? Some teachers are awful too and the only way to learn is to get your hands on a solutions manual and reverse engineer your understanding. It can be a very frustrating experience.