Hey there! Firstly congratulations for securing a good score! with 83 marks in MET( Manipal Entrance Test) and 90.53% in MPC 12th, getting CSE in Manipal main campus is difficult, as CSE has high demand and usually needs a much higher MET score. However ECE branch  has a good demand but may be slightly easier to get than CSE.  However you may have better chance for CSE or ECE in Manipal's sister campus like MIT Bangalore or Jaipur, where the cutoffs would be usually lower. If CSE is your top choice, you can consider these campuses or improve your MET score in second attempt if available.

If you need more assistance regarding counseling and applications feel free to ask. All the best!