Hello student

Yes, you can improve your marks through NIOS on demand examination.NIOS allows you to apply for the subject which you have passed for the improvement of performance.And this is organised for the theory part only.Students who are not satisfied with their marks can apply for the on demand examination through their official sdmis.nioc.ac.in.For more details kindly refer the following link-

https://www.google.com/amp/s/news.careers360.com/nios-conduct-on-demand-exam-for-students-who-want-improve-their-average-marks/amp