Dear Vinay, yes you can study B.Com after your 12th. It is a 3 year course. You haven't mentioned your 12th stream and your oercentage. Neverthless, you should score a minimum aggregate of 50% for being eligible for B.Com. Few Institutions conduct admissions based on the highest qualification like marks scored in 10+2 while few Institutions comduct admissioms based on the entrance examination. Few Institutions admit students with Commerce Background while few students admit other students from other streams as well. Even you can also study 5 year integrated programmes along with B.Com, like B.Com MBA, B.Com LLB, etc.