It is always advised by teachers to solve the questions which have been given at the end of each chapter. Students are suggested to solve the problems given in NCERT books as they are expected to come in the exams. There are lot of important questions and answers which have been given at the last of all chapters in your NCERT books. Please solve those questions to gain more understanding of the topics which have been explained in each chapter. You will be able to improve your knowledge of all topics and get more marks in exams.