Given concise and relevant explanation of every question from authentic books. Systematic approach by dividing questions into topic wise category. Save months of time searching for correct answers and adequate explanations from piles of books. Numerous tables, flow charrts and menmonic throughout the book for easy retention. Authentic questions have been taken from different MD entrance, UPSC and many states PSC. Additional valuable information relegated to the topic is excellently mentioned. Study material under the heading “read and Digest” For better understanding or subjects and rapid Revision. Latest question papers like aiapget-2019, 2018, 2017, uosc-2017 etc., have been included.