Hello Sujeet
Yes, interview is conduted for admission. For admission to Bachelor of Mathematics (honours), candidates will have to appear for two written tests comprising multiple choice questions and descriptive questions in Mathematics at the 10+2 level.
Based on the performance in the written tests, candidates will be called for interview.
Go through the link below for detailed information-

https://www.isical.ac.in/~admission/Documents/Eligibility-and-Selection-Procedure-2018.pdf

Good Luck!

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