Dear Samiya, you haven't mentioned your highest qualification. If you have completed your 10+2, there are Institutions which conduct admissions into B.A or B.Sc Psychology based on your 10+2 qualification. However, if you hold a Bachelor's degree in Commerce, there are few Open Universities that allow you to pursue M.A or M.Sc Psychology through Distance Education. But for you to be eligible to get into teaching, you will need a B.Ed degree. IGNOU is one Open University through which you can study Psychology inspite of your Commerce Background.