SOLVED. Characters are Dub and Skye, and it could be considered a young adult novel. [s]

[Jesse]

Genre:
-Young adult fiction
Characters:
-Dub, a girl whose real name is Wanda or Wendy and who goes by "Dub" because her name begins with a "W".
-Skye or Sky, a teacher who one student says "uses the force to decide their grade" or something like that.
-Marsh, I think the main character was named Marsh.
Remembered Scenes (Spoilers, Maybe):
-Dub tries to cook for Marsh (or whoever the main character is), but the meat for the meal is pink and she's upset by it.
-Dub cheats on Marsh (if that is his name) with Skye, and Marsh (?) is depressed.
-Dub goes from being a grungy, hoodie wearing type to being a hippie-like girl with flowers in her hair.
Book Cover:
-I'm pretty sure it's yellow.

[Sophie]

This is Rats Saw God.

[Lobstergirl, au gratin]

Jesse, was your book "Rats Saw God?"

[SparksofEmber]

PM'd Jesse.

[Lobstergirl, au gratin]

I agree this is "Rats Saw God." It has the characters Dub (formerly Wanda) and Sky, the MC is named Steve. Moving to Solved.