The allowance should grow with the student. Increase your child's allowance as they grow older to include more expenses and responsibilities. Have a planning session with older students at the start of each school year to discuss family expenses and where allowances fit in. Decide whether they should pay for school supplies, entertainment, clothing, and how much money they'll need. Yes, no, and maybe.
Opinions vary from family to family.
Just be consistent. Some feel the whole family should help, without pay, with all family chores. Other believe young teens need to learn the value of earning by working for pay at home. Teach by example. Students will learn the most about money by observing how their parents view and manage their own funds.