For: "Cual es tu class favorita?" means "What is your favorite class?"
You would answer like: "Mi favorita clase es ( Enter fav class here.)"
For: Te gusta la clase de matematicas? means "Is math your favorite class?" OR "Do you like math class?" You would answer "Si" or "No."
For: Que clase te gusta mas, la clase de espanol o la clase de ingles? means "Which class do you like the best, spanish or english?"
You would respond like "Me gusta (enter favorite class here)"
For: Te gustan los libros de historisa? means "Do you like history books?" or "Do you like history?" That's a yes or no question. You would answer with Si or No.
For: Que te gusta mas, el gimnasio o la biblioteca? means "Which do you like more, the gym or the library?" you would answer with "Me gusta (enter favorite here.)" Hope that helped!