Yes of course!! it is a good thing. Or even you can collect these books nd give it to some poor children. Nd that will be a heavenly thing. You will be blessed. wasting books and papers beyond a limit will also affect our ecological balance. Coz these books are made of papers nd papers are created by cutting trees. For making every 10/ 20 book 1 tree will get cut down. So this idea u have put forward is really a amazing one.