Within the constraints of age and grade, players compete against each other according to weight, based on standard categories.

Typically, the weight categories for boys are:

• Under 25kg
• Under 27kg 
• Under 30kg
• Under 34kg 
• Under 38kg
• Under 42kg
• Under 46kg
• Under 50kg 
• Under 55kg
• Under 60kg
• Under 66kg
• Under 73kg
• Over 73kg

The typical weight categories for girls are:

• Under 24kg
• Under 28kg
• Under 32kg
• Under 36kg
• Under 40kg
• Under 44kg
• Under 48kg
• Under 52kg
• Under 57kg
• Under 63kg
• Over 63kg  

It is not uncommon (particularly in girls' competitions) for weight groups to be combined if there is an insufficient number of entries.