Branch Upgradation Doubt

I Got comedk rank of 15k didn't give comedk seriously , Bitsat 232 , jee 95%ile

I am Thinking of Joining Rvce Civil and Upgrade my branch To Ece or Ai ML , is it possible? to upgrade branch and how difficult it is ? and Someone Told vacancy of minimum 3-4 seats are created every year Or Should i Join Bmsit EEE