How to group quality class competitions?

Different levels of competition are slightly different.

Under normal circumstances, the "quality class" contest is held by different age groups (generally divided into children's group, primary school group, middle school group and so on. ); The second sub-discipline (Chinese, mathematics, etc. ); The third is the specific grade (first grade to a certain grade). Occasionally, when the number of applicants is small, there will not be so many specific groups, and lots may be drawn for grouping. Specific analysis of the specific situation.