Friends, must watch this video to know about very important websites/apps which provide you free online mock tests, chapter wise tests, topic wise tests series and detailed excellent descriptions about all topics & concepts of your Engineering( JEE mains+advance ), Medical, Management, Pharmacy and school/college exams syllabus.
https://www.embibe.com/
https://byjus.com/
https://www.nta.ac.in
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