I am having 2back exam in my 5th semester ,can I get admission in mba or I have to clear my back exams first???

if you are trying to take admission in MBA than you have admitted provisionally and you have to submit your graduation mark sheet before the university enrollment.

Its also depend on exam policy of your university as if your university takes exam after one year for any semester than you have to wait for next year to attempt for 5th sem again than you will be eligible for getting admission in mba or if your university takes special exam for final year students