Hello there!

It depends on you , if you are someone who has always wanted to do engineering and study in one of the iits then you should obviously give at least one try by dropping 1 year for iit preparation and believe me 1 year is nothing if you work hard in that 1 year and clear iit , but if you are interested in doing b.sc then bhu is one of the best you can have so in that case you should not drop after clearing bhu entrance. So , take sometime and make a wise decision.

Thankyou