Clarity needed for Conversion from Final (Old) syllabus to (New) syllabus

Sandeep (in service) (142 Points)

01 April 2021  
I am Registered under CA final (Old) Course. (cleared my Inter CA very long back and articleship period is fully served). That time there was no scheme of GMCS or AICITSS training.
I want to give attempt for May 2021 Exam in New Course. I have not yet converted from Old to New Course but before filling Exam form I can convert from Old course to New Course by paying applicable conversion fees.
Can you please clarify whether I can give May 2021 exam attempt in New Course without GMCS or AICITSS clearance since I am registered under Old course.
I may attend this course post May 2021 exam.
I need clarity on conversion of Old Final course to New Final course and what is the last date of conversion ?
Can someone correctly reply and help me.