Ca exam form doubt

CA ASPIRANT (STUDENT) (380 Points)

11 February 2017  
I have registered earlier for Nov 16 exam but could attempt & now when i am registering for may exam as new user its showing Reg. No. & email id already exists. Then i logged in with Nov exam details my a/c opened. So do i have to continue with Nov login details & fill form or i Reg. as New user for May exam. & if with Nov login details then how should i proceed.