Hi Vijay

To get admission to IIT Kharagpur, you need to first clear JEE Main first with ranks upto 2,24,000. Then you will have to appear in JEE Advanced and after qualifying in this exam, you will get a seat in IIT Kharagpur. 

You need to check the cutoff of IIT Kharagpur, which is the minimum marks required for admission. In case, you have scored less than the cutoff for IIT Kharagpur, then you will not be entitled to admission. 

You can check the cutoff for 2017 as given below and estimate it for this year.

All the best ! 

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

Good Luck!!