How can I gain weight this summer?

I'm going into high school for the upcoming school year. I'm 14 (a girl), 5'3 & a half and I weigh like 117/118. My target weight is 127-130. How can in that range by the end of summer? I'm going grocery shopping soon, what foods should I buy to gain weight? I don't want like muscle weight, I want like actual fat weight.