Hello,

If your exam time is in second slot, that is 2 pm to 5 pm, then you should reach your exam centre at least one hour prior to commencement of the exam, reaching late in any examination isn't recommended at all, and once you reach your venue in advance you can at least relax, and depending on the exam duration if it's subjective and of three hours duration, you also have to write comparatively more to that of objective exam, hence it's best that you reach the exam centre one hour prior to the starting of the exam.