Vk global publications Pvt. Ltd. Is a household name now. Established in 1979, with more than three decades of leadership in the area of economics and commerce, we take pride in claiming that we continue with the unstirred readership in the country. Specializing in the area of economics and commerce, we are not averse to the idea of diversification. Keeping this in view, more than a decade ago, a series of 'exam idea' Was launched in all the subjects For classes IX -X however, success of our publication is admittedly due to prudent prolific writers. We have resource-pool of reputed authors, who leave no stone unturned in bringing out the best of study material, which makes our readers versatile in their thought processes and equips them with the exam-oriented acumen. Thousands of acknowledgment and accolades that we receive every year from our readers are a good testimony to the genuine efforts and trustworthy endeavour. Novel features of the present editions are as follows: the books have been thoroughly revised as per the new CBSE examination paper design. Basic concepts of each Chapter have been explained with the help of an easily understandable flow Chart. All NCERT Textbook (social Science and Science) and important NCERT Exemplar Questions (Science) have been incorporated depending on their weight age of marks. Important NCERT textbook and important NCERT Exemplar Questions have been incorporated in Mathematics, depending on their weight age of marks. All the questions have been divided according to the marks into three sections- very Short Answer questions, short Answer questions and Long Answer Questions. Hots (Higher Order Thinking Skills) questions have been inserted, which test the grasp of the concepts. Every Chapter includes a self-assessment Test. Solved model Question Papers and unsolved Model Question Papers have been inserted for ample practice of the examinations In IX-X. They are set as per the latest question paper Design issued by CBSE.