Hello,

The National Institute of Open Schooling (NIOS) typically conducts the Class 10 (Secondary) exams twice a year, in April-May and October-November.

- April-May Session: The exams usually start in April.

- October-November Session: The exams usually start in October.

For specific dates, you'll need to check the official NIOS website or your admission details, as the schedule can vary each year. The exam dates are usually announced a few months before the exams.

Hope it helps !