Hey,
Indian Institute of Science,Bangalore does not offer Bachelor of Technology(B.Tech) courses. It offers four year undergraduate programme in Bachelor of science which is organised in eight semesters. The programme is available in Biology,Chemistry,Earth and Environmental Science,Materials,Mathematics,Physics.
The basic eligibility criteria is that you must have studied 12th with Physics,Chemistry and Mathematics as the main subjects with atleast 60 percent marks.Selection is on the basis of the merit list in the following national level entrance exams-KVPY SA,KVPY SB,KVPY SX,IIT JEE Mains,IIT JEE Advanced,NEET UG.
For detailed information about IISC follow the link given below:
https://www.iisc.ac.in/ug/info_brochure.html
Hope this helps.
Good luck.

IISc Bangalore

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