new course vs old course

I am in CA final, registration wef aug2011, given Nov 2016 exam also but didn't clear. new course registration will be starting from 01.07.17, my question is that what I need to do for continue under old course or should I have to do some procedure with ICAI for persuing course under old course? is new course applicable for us (old registration student) if yes, what I need to do? can I apply it at later stage also?
thanks