No it is not necessary to Pursue MCA after BCA. You can go for various other higher studies options after BCA, some of them are listed below

Masters in Computer Management
Masters Degree in Information Management (MIM)
Masters in Business Administration (MBA)
Master of Science in Information Technology (M.Sc IT)
G-CAT Master
Postgraduate Diploma in Computer Applications
Post Graduate Programme in Corporate Studies (PGPCS)
Postgraduate Diploma in Management (PGDM)
Programme in Information Security Management