With 35.25 marks and 206 rank in NFSU Gandhinagar B.Sc Criminology merit list under ST category and Defense Priority 6, your chances depend on the availability of seats after higher priority candidates. Although your ST category and defense quota give you an advantage, Priority 6 is relatively lower, so chances will increase during later counseling rounds or spot admissions if seats remain vacant. Stay active in counseling rounds and monitor seat vacancy updates closely.