Looking at data is only a small piece of the picture. Most of education is social and can't be taught on an iPad.
You have to learn that you need to wait your turn, not everyone can talk at once, that you will be judged by third parties, how to put up with bullies and ignorant people, how to avoid getting in trouble, how to deal with dating, differences in background, diversity, varying talents, handicapped people, sports, music, etc.
This data obsession is beyond stupid..it's one of the biggest problems. Schools exist for far more than any test score and I deeply question outlays of valuable--very limited--resources on new technology.
I'm not a luddite either....I like tech or I wouldn't be here. But, I also don't doubt that a kid would see far more benefits from having 10-1 student teacher ratios rather than 35-1 and iPads.