Science and Technology Based on NCERT: for Civil Services Examination and Various State Examinations About the Author Sheelwant Singh, the author of more than twenty books from several publishing houses including McGraw Hill Education, is an Assistant Editor at Pratyogita Drishti – a leading magazine for competitive examinations in Rajasthan. He has taught at various institutions for Civil Services Examination preparation. He is presently running an institute called BRAINZ IAS in Lucknow in the capacity of Founding Director.Kriti Rastogi is a post-graduate in Sociology and a PHD in Economics. She is currently teaching at various civil services institutes and universities like Dr. B R Ambedkar University. She specializes in International Relations, Current Affairs and Indian Economy and Development. She writes for various print media and also actively participates in debates in the electronic media.Sarika is a post-graduate in Socio Engineering and Human Resource Management. She teaches at many civil services institutions. She is very well informed about current social, political and cultural issues facing India and the World and writes for various newspapers and magazines.