JEE Advanced maximum are not defined

Maximum Marks vary every year like below:

 2017- 366

2016- 372

2015 - 504

2014 - 360

So, it is difficult to predict marks as exam pattern and marks change every year but you should score more than 50% marks to get good branch in Top IITs.

You can get an idea about the cut off rank from the given below link

https://engineering.careers360.com/articles/iits-cutoff-for-b-tech-aerospace-engineering

Good Luck!!