School of Engineering, UPES

First of all, it is good to know that you are opting for B. Tech in Aerospace Engineering. Second, UPES is one of the best choices to get a degree in this outstanding engineering field. Now coming to your question, to take admission in UPES, you can appear for UPSEAT if you have secured minimum 60% marks at Higher & Senior Secondary level (class 10th & class 12th) or minimum 60% aggregate in Physics, Chemistry & Mathematics at Senior Secondary level (12th).
UPES also offers admission through Board Merit / JEE Mains Score. 20% of seats are available for those taking admission through their JEE score. There is a total of 60 seats in B. Tech in Aerospace Engineering.
And as you have mentioned that your marks are above 80%, you can easily apply for B. Tech in Aerospace Engineering at UPES. All the best.