Hello Rohith, Greetings!
Well there are many other ways to get into IISC other than KVPY. They are listed below:
1. Bachelor of Science (Research) programme: You get into IISC by by qualifying JEE Advanced with top rank to get in core courses of Physics, Chemical or Mathematics.
2. M.Tech/M.Tech (Research): The only exam is GATE and rank varies from year to year depending on the department and number of vacancies/students applied.
3. M.Des: This is 2 years Master’s program in Design. Admission is made through two exams CEED & GATE.
4. M.Mgmt: This course is similar to an MBA (with a focus on Data Science) and there are two exams for getting admission into this course CAT & GMAT.
Besides you can pursue Ph.D by submitting research papers in IISC.
Thank you, hope this helps.