Hello Rohit,
Indian Institute of Science, Bangalore offers admission to four year Bachelor of Science (Research) programme. Students have to appear for exams to be eligible for admission. Selection of the candidates is done on the basis of any one of the national exam like IIT JEE (Main), IIT JEE (Advanced), etc.
You can go through the link below to check the details about the course-

https://www.iisc.ac.in/ug/faq.html

Feel free to ask if you have any other query.
Good Luck!

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