Yes, you can do M.Ed if you have acquired B.Ed. In most intstitutes, the eligibility criteria for pursuing M.ed is that you should have around 55% in B.Ed.Like in IGNOU,the eligibility criteria for M.Ed is- 

B.Ed. with fifty five percent marks. Two years teaching/professional experinece after completion of B.Ed programme in a Government/Government recognized school/NCTE recognized teacher education/research institution in education.