With a JEE Main percentile of 51 and an OBC-NCL rank around 2.8 lakh admission to NITs, IIITs, or GFTIs is not possible, as these institutes usually require an OBC rank below 50,000. However, you can still explore state-level counseling where some government colleges accept higher ranks. Private universities like SRM, VIT, or Amity also offer good programs and may admit students with moderate scores. Alternatively, you can consider B.Sc. courses such as Cardiology or Computer Science through CUET, where cutoffs are generally more accessible. If you've determined to get into top colleges, taking a drop year to prepare and reattempt JEE is also a valid option.