If I have not completed M.Sc degree but I have completed M.Ed degree. Is there any necessity of doing M.Sc?

If you wanted to pursue a job or a another M.Tech degree in the near future then it is necessary to complete your M.Sc.

If you are looking for a job in the teaching sector, an M.Ed should be sufficient to land you a good job. There is no need for an M.Sc. Degree. Regards.