I dont think that u can score such a good rank just by studying for 4 months because most of the students prepare like hell for clearing JEE. Some of them even take coaching from 8th class also. But it if possible if u are veryhard working and goal focussed because u have to compete with a huge number of the students all over India. Also take a good guidence and advices from ur lecturers for the fast and effective means of preparation.
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