Citation, please? Indeed a lot of refugees are educated professionals, and read and write not only in their native tongue, but there are likely more than one of those.
The integration into Germany is pretty well documented, and no doubt there are a few problems, but not of the magnitude you infer. Merkel does a pretty good job of attempting to enforce real integration, not just pockets of refugees, having learned that from huge Turkish immigrations of not long ago. I dispute both the numbers, and their inference.
Millions upon millions of Germans, French, Spaniards, Italians, Eastern Europeans, the varieties of the Rus, not to mention Chinese, Japanese, Thai, Hmong, so many others DIDN'T SPEAK THE LANGUAGE and a generation later, their kids are largely homogenized. Their parents will stick to the old ways, just like C coders. Fine. They're good and upright citizens. We need skilled workers, and not so skilled workers. Real GDP needs actual people doing actual work at all levels. Let them come.