thanks hetvi for A2a
Switching to new syllabus seems to be a wiser option and it is a wiser option.
sticking to old syllabus does not make any sense or else you will have to take the eligibility test which will make the process longer including a redundant step for you which you can escape easily.
another advantage of new syllabus is that it is more concise, more organised and more user friendly. when it comes to new syllabus less intricate questions will be asked.
so with all these reasoning you should stick to new syllabus as soon as possible.
all the best and happy learning.