Since you have completed B.Sc(IT) and still interested to proceed further for higher studies, you can choose M.Sc( IT) where in you will have detailed studies in Networking, Database and System - programming and such modules will help you to have sound concept in these areas. With the mastery in this areas, you may be assigned to the job of IT consultant, Support- developer, Software, etc.
Of course, MCA's are always leading in terms of employment, since it is a three year course giving you in depth exposure in functional areas, computation, familiarity with different modules such as Java- application, C++, Oracle application etc. Considering the course span between MCA( three year course) and M.Sc(IT) consisting of two year course, the former seems to be superior in terms of enriching various modules.
You can pursue your course with IGNOU, Symbiosis, Annamalai - university and Utkal - university - distance education mode etc. These purses are well recognised and have approval of ministry, HRD.