There are no such big names for CSIR NET MATHEMATICAL SCIENCE offline. But if you think of Eduncle, Dipsacademy, Unacademy are said to be the famous one and most preferred one as per online.
I would say you should try to contact any local teachers so that you can have face to face classes in order to have a better score.
I hope this answer helps. All the very best for your future endeavors!
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