The present edition of the book is strictly according to the revised curriculum of the C.B.S.E and latest N.C.E.R.T Text book for the session 2020-21. In this edition, we have given a separate NCERT Corner at the end of each chapter which contains all the examples and exercises of the NCERT Text Book alongwith answers and hints. It further includes NCERT exempler problems, latest C.B.S.E sample paper, HOTS & Very short answer objective questions.