Dear Praveen,

JEE Advanced maximum marks 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 check the cut off rank from the given below link

https://engineering.careers360.com/articles/jee-advanced-cutoff

Good Luck!!