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There are various colleges which offer MSc Mathematics, you can apply for various entrance exams which are conducted by top colleges such as IIT JAM, NEST, CUCET, CMI to name a few, there are also colleges which offer admission based on the merit if the qualifying examination, some of the top universities are Delhi University, Banaras Hindu University, Jadavpur University, Chennai Mathematical Institute apart from IITs,NITs, you can visit our page at https://university.careers360.com/colleges/list-of-msc-in-mathematics-universities-in-india to know the full list of colleges.