Hello student you need to check details on the admit card given by the NIOS administration department.

You can also log in on the nios website through your credentials and get the details about your upcoming examination.

You can visit on the link mentioned below and know the syllabus of mathematics for nios exam.

https://nios.ac.in/online-course-material/secondary-courses/Mathematics-(211)-Syllabus.aspx

Feel free to comment if you have any doubt

Good luck