You have to score more than 75% marks in 12 th board. 

And as this branch is not available in every college.so

Your rank will decide your place and it depends upon the college you want and number of candidates apply for that seat 

Since you should score 250+  

It will be a good score you may get aeronautical

Good luck

Hi there!!!
It's as interesting question as It's answer so, as u had been mentioned in stuff , it's all depends on how much the aspirant do in a exam exactly.
But I didn't take your time , coming to the point,there are many criteria which part as a fact to decide percentage eligibility.
Since last 4 years, the criteria is about an average 85%,do matter in the admission process.
If any more doubts just ask in comment session.

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