Hello Sudipta,

The exams conducted by the Calcutta University is considered to be the toughest one. You can get the model question papers on the various websites. Kindly check it on Google. Solving previous year question papers will help a lot in cracking the exam.

For further details refer to the link given below -

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/question-calcutta-university-msc-entrance-details-for-2019-with-previous-five-years-question-for-mathematicskindly-help-me/amp&ved=2ahUKEwis_fbg_NnmAhVVfH0KHSyNCl0QFjAAegQIBhAB&usg=AOvVaw07RJCCDGqpoM1HhnAl1u59&ampcf=1

Good luck,

Hope it helps :)