I don't know where your school is. Students have different tastes, but some dishes come from North Korea and Xian Yi. Here I only give you some recommendations with local characteristics.
For example, stewed lion's head in Jiangsu and Zhejiang (if the starch content is a little more, the cost can be controlled, and the relative taste will be reduced), crab powder tofu (the common folk practice is to use salted egg yolk or egg yolk instead of crab powder, so it is not expensive), chopped pepper fish in the south of the Yangtze River (small ones are sold in the school cafeteria), and maocai spicy pot in the northwest (this is very fragrant, and students take their own vegetables and weigh them to collect money, usually 250 grams of 7 pieces, and then burn them quickly with the bottom of the pot). Wait a minute.
Breakfast includes glutinous rice balls in the north, jiaozi in Nanjing, rice noodles in Yunnan, Wowotou in the north (steamed noodles are delicious), Regan Noodles in Wuhan and Zhajiang noodles in Beijing. The baked rice cake is also very fragrant, one yuan a piece.
I hope it will help you, and you can think more if necessary.