You have not clarified the course in which you have completed your graduation. However, the best step to do after B.sc is to do higher studies i.e. M.sc . You can pursue M.sc in your desired field. It will result in immense career opportunities before you. Even after completion, you can go to jobs in firms and industries as per the course you have mentioned and can even do PhD if you have interest in teaching.

Hello,

After completing a BSC from IISC there are several opportunities that you can take up you can apply for Research assistant or project assistant in various institutes. Or you can go for internship at good institutes or firms. You also have the option to go for higher studies like you can apply for masters , PH.D. If you are interested in some other areas you like UPSC , you can prepare for that and take up civil service, or you can apply for MBA by taking CAT. These are some of the options and you can make a choice according to your interest.

Hope this helps you.