Hi,
CCMT (Centralized Counselling for MTech / MArch/ MPlan) is basically an online counselling process that takes place in order to take admissions into M.Tech/M.Arch/M.Plan courses offered by various NITs, IIITs, etc.
The available choices during the counselling process might have been cut down due to the eligibility criteria. Each of the institutions seem to have their own eligibility criteria for the admission into their various courses.
This might be the reason as to why you might have less choices during the allotment in the counselling rounds.
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