Many student select commerce at 10+2 (12th) or at graduation level because they think Science is tough subject to select and arts are not interesting subject, so they go for 10+2 (12th) or graduation in Commerce stream.
If you read commerce subject with full interest and understand the subject well, you will have great opportunity for job.
If you are looking for job on the basis of only 10+2 in commerce, you will have very little opportunity for job. Most probably you will get job as accountant in small business house with salary around Rs10,000 to 13,000 per month.
The best option for 10+2 pass out in commerce stream is to go for B.Com from reputed college.
After getting B.Com degree you will have lot of opportunity. If you are very efficient in your subject of B.Com, appear for CA (Chartered Accountancy) exam, if you qualify in the exam, you will get huge salary something around Rs 80,000 per month to Rs 1,50,000 per month depending upon in which company you are going to work as CA.
Otherwise go for MBA from reputed college, prepare for CAT exam and do MBA from IIM for very high pay package of around Rs15 lakh per year. But CAT is tough exam as many engineering student also appear in this exam.
If you directly want to do job after B.Com, you will have lot of opportunity in various job profiles like, accountant, Business analyst, tax consultant, business manager, business adviser, salesman, shop manager, business crew manger etc. Starting salary will be around Rs 12,000 per month and it can go as high as Rs 50,000 per month depending upon your caliber and experience. You can find various job opportunity information for B.Com graduates at different popular job portals like naukri.com etc.