Hello aspirant,
You may have some chances to get MBBS seat in deemed medical college with score of 340 marks in NEET 2021 but as you know every year cutoff changes based on various factors like no. of students appeared for NEET, difficulty level of paper and previous year cutoff trends etc.
So from below link you can predict colleges based on your score
NEET 2021 College Predictor – Know your College Admission Chances Base ...
Hope this information helps you
Best of luck
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