Dear Monika, the Mathematics wing in JNU is a part of the School of Physicsl Sciences. For being eligible for studying Ph.D in Mathematics, you should have completed your M.Sc either  in Physics/Chemistry/Mathematics with a minimum aggregate of 55%. If you haven't studied Mathematics in your Masters but majored in Physics/Chemisyry, then you should have studied Mathematics in B.Sc atleast.
JNU EE is the entrance examination for admission into Ph.D in Mathematics. At this point in time there is no official notification for admissions based on the Entrance Examination. However based on the previous years rrends, the exam will be conducted tentatively in the month of May and results will be announced in the month of June. Please watch out for their official website for more information.

Hi Aspirant! Jawaharlal Nehru University provides Phd in Mathematical Science and not in Mathematics. The admission is based on the entrance exam of the university. For more information, kindly check 

https://www.careers360.com/university/jawaharlal-nehru-university-new-delhi/phd-mathematical-sciences-course

Jaipur National University doesn't have Phd in Mathematics. But , the admission is via entrance test conducted by the university. 

I hope this information has helped you! 

Jaipur National University

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