Sir I'm from Bhubaneshwar and I got 55% in class 10 and more then 70% in 12 class. I'm afraid because of my low marks in class 10. So can I get into btech at kiit university?

You need to have scored 60% on average in Physics, Chemistry and Mathematics combined in 12th, in order to be eligible for KIIT University B.Tech degrees. For final admission, KIIT selects students based on their KIITEE score. 

So, if you clear the required cutoff, you can get into B.Tech at KIIIT University through counseling.