Hey it purely depends on which field you are studying currently. If you don't specify your field then it would be very tough to answer these. If you want to become a professor give the exam UGC NET. Through this exam you can directly apply for the post of assistant professor. Or pursue your higher studies and do PhD and post doc. Then you can become eminent professor in your field of interest. But this is a long process. If you have passion towards your study then go for it.