Exams will happen twice in a year. One around Jan/Feb and another one at Jul/Aug depends on the region.
You would get a hall ticket with a date for your region. In case if you have not got, please reach out to nearby samskrita bharati office.
This time Chennai exams were completed on 2-Feb and for Bangalore region exam will be on 23-Feb. If you belong to any other region, please check with SB on this.
All the best.