Hello,

IMPR on NIOS marks card means Pass and Appeared for Improvement. So basically saying you have passed the exam but have applied for improvement in a certain subject. NIOS allows a candidate to apply again in a subject, which they have already passed for improvement of performance but only once. And when you appear for admission in colleges, they will ask for your marks card and other documents which will be submitted there for all those years that you will be studying there and these marks card should be after all successful examinations. So it is advised to the candidate to clear up all the exams even the improvement exams of any kind.

For more information regarding another doubts on NIOS related things refer the official website and contact them through mails,

https://sdmis.nios.ac.in/

Hope this helps.

Good luck!!