Hi, Your focus should be KVPY exam. Through this your chances to crack admission in IISC will increase. Once you are able to make it in IISC your scope opens up for various oppurtunities in future. Also the other way is A four-year bachelor's degree may be sufficient for many scientist positions. However, if you want to work independently or perform industrial research a doctoral degree is often required. This is the highest degree a student can earn and usually consists of an additional four to eight years of college study after your bachelor's degree. However Btech is required to become a scienist. Good Luck.