I got 8 right, but I take issue with the other two. I actually got #4 right if going by US convention, which is how I was taught. I dispute the answer to #2. There are only 10 uses of punctuation in the sentence. How can there be 12 errors? Do the " count as 2 each? If they do, I'd still say that each time they are missing is one distinct error, rather than two. Are they counting capitalization?

note: the above post was not checked for punctuation, and may contain egregious uses of it.