Hi Mohammed,
To calculate the NATA cutoff, your board percentage is added to the half of your NATA score. In this case, 74.3 + (120/2) = 74.3 + 60 = 134.3.
A NATA cutoff of 134.3 out of 200 is a decent score. You can definitely try for a merit seat in your state counselling. You can try for a decent college in Chennai, if not the top ones. You can also go for private universities like SRM.
All The Best
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