Learn Science & Technology subject with coverage of 2 Years Current + Static by Arvind Singh Rajpurohit Sir ( Prelims Score 2019: 143.34 ) To more explore at below link: https://www.upscguide.in/subscription-plans/science-tech2-yrs-current-static-for-prelims-2021 710 viewsUPSC.GUIDE IYI, 06:44