Hello Hemant,
You can participate in the REAP procedure using your Jee Main score. Your chances of receiving core branches are considerable if your score is higher than 140. If your general category score is between 100 and 120, you may have a chance to work in unconventional fields like P&I and others. Therefore, if you desire core branches in MBM, practise hard and achieve high Jee Main scores.
Good Luck
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