Top critical review
I attempted 10 questions in CSE Pre 2020 from sci n tech part...
Reviewed in India on 31 August 2020
i have purchased two books in science and technology.. one this book by Dr. Ravi and other esencia-science and technology by Dr. HS Sidhu. After going through these books i would like to say that both books are required for UPSC preparation as in IAS PRE 2020 out of 11 questions of Sci n tech part...7 questions were from esencia- Science and technology by HS Sidhu Sir & 3 questions were fron Sci n tech by Ravi Sir. only one book can't serve the purpose. Because which topics are missing in the one book are written in the other, certain topics are very well explained in esencia - Science and technology and certain topics are good in Dr. Ravi,s book. More over esencia also covers basic Physics and chemistry which are lacking in this book. Dr. Ravi's book contains the previous year questions also. In esencia every topic is explained from basic to advanced level in the form of mind maps and with hundreds of diagrams. so in nutshell one should not consider both these books as the separate ones rather these books should be considered as vol 1(esencia - Science and technology) and vol 2 (Science and technology by Dr. ravi) . so one must first go through vol 1(esencia - Science and technology) and then through vol 2 (Science and technology by Dr. ravi).'