Step 2: Let them eat for free. You and your close friends deliberately discuss propaganda and let them share food with their overnight friends, saying that they bought it from you.

Step 3: Post the list, milk tea, spicy food, etc. Post the grade first, all of them.

Step 4: Finally, make a dormitory for other members of the opposite sex (you have to be a boy). Provide delivery service. Including the whole school, you will be crowded across from the shopping department. If it helps you, be a friend.