I have got a supply in maths in 5th sem of b.sc.what should i do now?i have appeared in 6th sem.which course should i opt now?msc or mba?

Its better that you clear your backlogs first. If you think you can be a good manager and have the requisite skills, its good to opt for management programmes, but if you are bound to scientific research or academics, its better you pursue M Sc

If you want some change in your career then MBA is good option