There is a good chance that Jadavpur University will accept your NIOS improvement exam marksheet for Maths, but there could be a few factors to consider:

The university might have specific guidelines regarding accepting improvement exams from NIOS or other open schooling boards.

Look for the admission brochure or information on the university website related to eligibility criteria for admission. This might mention the acceptability of improvement exams.

Contact the Jadavpur University admissions office directly and explain your situation. Inquire whether they accept improvement exams from NIOS for Maths and if there are any specific requirements or procedures to follow.

Many universities in India accept improvement exams from NIOS or other recognized boards as long as it improves your overall score and meets the eligibility criteria for the program you are applying to.

Getting clarification directly from Jadavpur University is the most reliable way to ensure your NIOS improvement exam marksheet will be accepted for admission purposes. This proactive approach will help you avoid any last-minute surprises during the application process.

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I hope it helps!