As far as DTC is concerned, it is set to be rolled out wef from 01.04.2013. So it will not effect Nov 13 exams. For Nov 13 exam AY 2013-14 will apply.May be from May 2014 it will be applicable. (provided it comes into effect wef 1 apr 2013)
Regarding GST, depends on the date with which it is brought into effect.