If you get into top NIT or BIT with desired branch then i wud advise you to drop the iidea of dropping a year coz dropping will not make it sure that u will get IIT next yr also many don allow gap year during the placemnets. but if u havent cleared JEE and are very ambitious for JEE then u should drop . otherwise u have the best NITs of our country with the best of d branches. so make the best possible decision and ALL D BEST
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Amit - IT BHU