Bro give your improvement exam...in two sub.for improving percentage while admission in nit or IIT as u are having 75 % total then no issue from your previous marksheet so give that one  or both your choice while feeling jee mains form you may right appearing for improvemetn agar man kiya toh admission ke vakt bas teko 75% dikha dena hain

Hi Arnav,

Considering JEE counselling,You don't have to give all the papers for 12 CBSE as,for JEE counselling they accept even only one improvement exam.But for BITSAT ,they will accept only if you give all the papers for improvement exam.

ALL THE BEST FOR YOUR SUCCESSFUL CAREER.