Hi Nilesh.

IISc bangalore provides BSc programmes in various streams like Biology, Chemistry, Physics, Maths etc. You can pick the right one you want. Read about these courses and pick the one that is interesting for you. The admission is based on 4 examinations. KVPY, JEE Main, JEE Adv. and NEET-UG. You can apply through their website for these courses. The details are clearly given in their website.

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

Good Luck.

IISc is india's top institute in the field of research.For 12 pass there is ug courses like BS(bachelor of science).You can do it.It is in this context that the Indian Institute of Science offers a unique 4-year Bachelor of Science (Research) programme. The graduates of this programme will obtain a Bachelor of Science (Research) degree in a specialization. This programme is carefully designed to offer specialization in a science subject, but the knowledge imparted carries a strong flavour of engineering and an exposure to social science disciplines. Students specializing in a Major subject are encouraged to take courses on other subjects, thus maintaining the strong interdisciplinary flavour of this Bachelor of Science (Research) programme. All students take core courses in Physics, Mathematics, Chemistry, Biology, Engineering and Humanities in the first one and half years (I, II and III semesters). While specialization is introduced rigorously in the following year and a half (IV, V and VI semesters).