Hi 

I am assuming that DCET is Diploma Common Entrance Test as conducted by KEA.

For this, an entrance exam is conducted followed by result announcement, counselling and seat allotment procedure.

Refer to the links below to know more:

http://kea.kar.nic.in/dcet2018.htm

http://kea.kar.nic.in/diploma_2018/dcet_2018_exam_timetable.pdf

http://kea.kar.nic.in/diploma_2018/diploma2018_brochure.pdf

Hope this helps.

All the best !