What do the students teachers think a bout using iPad

Hello there,, I want to make for me proposal research about ( what do the students teachers think about using iPad. I was given him before the proposal but he couldn’t agree with my work. The professor wants to make measures with two different schools specifica with grade. He asks me to give him measures two schools who using iPad is different the grade with students who have to use iPad or not. I mean here using iPad is reasing the grade or drop?. Also, I want APA style with 10 reference with it. Thanks.