Hello Praveen Kumar Swami. Thanks for contacting Careers360 and we hope we will be able to answer your query.

Please note that the safest bet to enter into IISc would be through the KVPY window, as the cutoffs through JEE Advanced are quite high. 

I would like to direct your attention to this link for more information:

• http://www.iisc.ac.in/ug/news.html

Also, please see this Quora question for more information as to how you can get admission into IISc:

• https://www.quora.com/How-do-KVPY-fellows-get-admission-to-IISc

Hope this helps you and all the best!