YA novel i read in elementary between 2013-2017 about a girl who goes to a spy school

[Creativity360]

She goes to a school where her and others train to be spies. They do all sorts of ability tests and at first she has trouble so has to practice a lot in order to become top of the class. The cover has a girl on it and has a black/green/purple color scheme.

[Rosa]

I'd Tell You I Love You, But Then I'd Have to Kill You?

[Darcey]

Sounds like something in the Gallagher Girls series by Ally Carter (the other person’s suggestion is book one of six).

[Creativity360]

i have read a Gallagher Girls book (years later) and the story/world was completely bew to me so I know it wasn't one of those