Hello Nitika, Yes, you do need mathematics as a subject in your 12th examinations if you are applying for MBA / MBA HR / MBA Decision Science & Analytics courses. Also you do need TOEFL/IELTS to prove your english proficiency. The minimum TOEFL score is 80 and minimum IELTS score is 6.5. Visit this official website for eligibility criteria:

https://upload.nmims.edu/admission/handoutadmission2020.pdf