Hey Nitin,

Hope you are doing great as per your question there is fixed score that you have to score for getting in aerospace engineering you only have to focus on your rank as the difficulty of the paper changes every year and score increase or decrease according to the cutoff. But you need  to have rank about:

General- around 10,500

SC- around 11,000

ST- around 12500

For further querries you can use the link given below

https://engineering.careers360.com/articles/aeee-cutoff

Hope you found this answer useful.Stay motivated stay positive.

All the best!