"Goddess Boot Camp" by Tera Lynn Childs

This is a pre-owned copy with dust jacket in good condition. 

Phoebe, who recently discovered she’s a descendant of Nike (the goddess, not the shoe), is finding that supernatural powers come with a crazy learning curve. Her stepfather, headmaster of the Academy for descendants of the Greek gods, has enrolled her at Dynamotheos Development Camp—aka Goddess Boot Camp—with a bunch of ten-year-olds for the summer. Embarrassing as that is, hopefully it’ll help her gain control over her powers in time to pass the test of the gods, continue training hard enough to qualify for the Pythian Games, and enjoy her godly boyfriend, Griffin, all while avoiding the ultimate mistake of accidentally misusing powers.

It’s another fast-paced myth-inspired heroine’s quest that’s sure to bring out the goddess in anyone.