Burn for Burn by Jenny Han and some other person that I forgot their name.
Splaaa (her spitting on Rennie)
Revenge on Rennie
Revenge on Reeve
Revenge on Alex
Kat (the girl in the grey shirt) just spat on Rennie (the girl in the cheer uniform) because she got upset at Rennie for calling her a freak. Mary is the girl in the light blue hoodie in the back. Lillia is the girl in the pink sweater. Reeve is the boy in the blue helmet. Alex is the boy in the yellow helmet.
Lillia, Kat, and Mary are plotting a revenge plan. Lillia wants revenge on Alex for hooking up with Nadia, Lillia's little sister. Mary wants revenge on Reeve for bullying her in middle school. And Kat wants revenge on Rennie for kicking her off of the cheerleading team, unfriending her, and starting rumors about her.
Lillia got revenge on Alex by, on his jersey his last name says Limp, but his last name is really Lind.
Kat is getting her revenge on Rennie by making Lillia the prom queen and not Rennie. Mary is getting her revenge on Reeve by making him fall off of the stage and get hurt so that her can not play football.
After prom Lillia, Kat, and Mary go out to the woods behind Lillia's house and talk about what just happened, and what to do next.
At the end of the book, the girls find out that Mary killed herself when she was 13 years old and they have been talking to her goustly figure. Rennie had been in a car crash and died. Reeve and Lillia fell in love and started to date. Alex has moved on and went to collage. Kat and Lillia have became friends again and they are trying to figure out hoe they were talking to Mary.