if I give 2 mock tests per day of jee mains (full syllabus) for 20 days....will it be beneficial?
Yes, ideally if you have completed your full JEE Syllabus, you must regularly solve one or two Full Syllabus Papers, Previous Years, Mock Tests as well as Test Series, besides regular revision. But do ensure after the test you do proper analysis of the paper and note all the unknown and new information you came across during the test.
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https://engineering.careers360.com/articles/jee-main-preparation-tips/amp