Tommorows the first day of summer school?

Okay so im 13 and a girl.. should I scrunch my hair? and my mom told me I didnt have to bring anything but should I bring a notebook and a pencil just incase?? What type of shirt should I wear? A band Tshirt or aeropastle..and Shorts? I only have short shorts that are denim... And Osiris shoes? Do they allow flip flops? HELP!!