The NIOS On-Demand Examination System (ODES) allows students to appear for exams at their convenience throughout the year. It is especially helpful for learners who want to reappear in failed subjects or improve their performance in selected subjects of Class 10th or 12th. Exams are conducted monthly at NIOS regional centres, providing flexibility and faster results. https://niosadmission.com/nios-on-demand-examination/