hello

ceed exam eligibilty criteria states that

Passing a degree/diploma/postgraduate degree programme of four years or 3+2 years (after 10+2 level) is mandatory. However, those appearing for the final exam of such a programme by July 2019 were also eligible to apply.

so most probably as per the above instruction you can give the exam only in msc final year or after your msc.

hope it helps.