Footnote: Always check with your professor before using any solutions manual. Some instructors actively design unique problems not found in the standard manual to encourage original work.
Buy the official textbook. Buy or rent the official solutions manual. Use it like a coach, not a cheat sheet. Work through every problem until you can derive the answer without looking. That is when you truly move from reading physics to doing physics. --- Fundamentals Of Physics 12th Edition Solutions Pdf