Education Store
How to know if I’m eligible for education store price for my MacBook Air? Do they need any prove upon delivery or checking out?
MacBook
• What proof do I need for educational discount? - Apple Community
https://discussions.apple.com/thread/3302181
• Education Pricing and Student Discounts - Education - Apple
https://www.apple.com/us-hed/shop
• Education Store - K-12 - How to Buy - Apple
https://www.apple.com/education/k12/how-to-buy/
For help with sales or Apple Education Online Store registration, call 1-800-800-2775.
You will need to have proof of enrollment in an institution or satisfy the requirements.
And this may require discussion with school, or with Apple for further details.
Should you not qualify for hardware discount at Education store (online, etc)
look/see if your country or regional online Apple Store has 'refurbished' Macs.
https://www.apple.com/shop/refurbished/mac