Since you are preparing for M.Sc programme, you need to have a single minded devotion to excel well in the current exam since a high second class marks would be essential to appear for the NET test - a test essential for the selection of Lecturership in a Government - college.
However, the other option is to enter a private college after securing the Post - graduate degree and acquire the experience in the teaching line and in that way, you would gain experience in teaching in the subject in which you your specialisation. While continuing the Lecturership in the college, you may persue for the doctorate degree. Your doctorate degree can land into a permanent job in the constituent college. In that way also,you will be exempted from NET test.
If interested for the Banking jobs such as PO, your graduation degree is enough for your eligibility, but in that case, your minimum aggregate in the graduation - level should be above 50 percent. With your prudent planning in current affairs and Mathematics, you can qualify in PO examination conducted by the Banks. You would be getting an attractive package there apart from the job - security prevailing in that sector.