To purchase student tickets for the Damai Music Festival, you can follow the steps below:

1. First, open the official website of Damai.com, select the performance or event you want to purchase, and enter the purchase of the event. Ticket page.

2. Find information such as "fare and seat map" on the page and find the student ticket information you need to purchase. Please check the eligibility requirements and discount amount for student tickets.

3. Click the "Buy Now" or "Purchase Seat Selection" button to enter the page for selecting fares and seats.

4. Select "Student Ticket" in "Fare Type" and enter a valid student ID number in the "ID Number" column.

5. After confirming that the selected student ticket information and seat information are correct, select the payment method and enter the relevant information to complete the payment.

Please note that the specific operations may vary depending on different activities and performances. It is recommended to read the ticket purchase guide of Damai.com in detail and ensure that the information entered is accurate.