Hi Gayathri,

To calculate your NATA cutoff, your board percentage and NATA  score is required. Now, your board percentage is, 89.5 %. And half of your NATA score is 62.5. Adding them both, 89.5 + 62.5 = 152. 

152 cutoff out of 200 is a very good score. And you can definitely get a seat in government. You can ofcourse try for Thiyagaraja. 

All The Best.