More About NCERT Exemplar Problems Books The main objective of the books on ‘Exemplar Problems in Mathematics, Physics, Chemistry or in Biology’ is to provide the teachers and students with a large number of quality problems with varying cognitive levels to facilitate teaching-learning of concepts in all subjects that are presented through the NCERT Books for Classes 9th, 10th, 11th and 12th. It is envisaged that the problems included in these volumes would help the teachers to design tasks to assess the effectiveness of their teaching and to know about the achievement of their students besides facilitating the preparation of balanced question papers for unit and terminal tests.