The CSS (Central Superior Services) exams in Pakistan are typically held once a year. CSS Exam is conducted during February and March each year. The exact dates for the exams may vary from year to year, but they are usually conducted in the early months of the year. The Federal Public Service Commission (FPSC), which is responsible for conducting the CSS exams, announces the schedule and dates for the exams on their official website. It is recommended to regularly check the FPSC website or other official sources for the most up-to-date information regarding the CSS exam schedule.