Science and Technology: Civil Services Prelims and Main Examinations (2019) by Pearson About the Author Dr Sheelwant Singh - Founder Director, Brain’z IAS: - A leading coaching institute in Lucknow for IAS, Banking and SSC. He has worked with many renowned institutes. A gold medalist and national award winner, he has many bestselling competitive examination books to his credit like NCERT Saar Sanchika, Samvidhan Evam Rajvyavastha, Samanya Vigyan etc. to name a few.