Ayushi, there is no branch called Aeronautical Science specifically in IIT Bombay. Although there is a course for Aerospace engineering and I will be answering with respect to that. In case of any queries, please mention in the comments section.

Now the admission to the IITs is on the basis of JEE Advanced rank and not the percentile. The marks required for a certain rank changes every year depending on the level of the question paper and the performance of the appeal candidates.

I will provide you the past years' cutoff rank of IIT Bombay for Aerospace engineering below for the general category:

2019

• Gender Neutral: 2082
• Female: 4550

2018

• Opening rank: 1040
• Closing rank: 2053

2017

• Opening rank: 749
• Closing rank: 2036

2016

• Opening rank: 838
• Closing rank: 1841

For the category wise cutoff of all branches in IIT Bombay for the years 2016 to 2019, you can visit: https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-bombay/amp