It definitely should not be illegal. I was spanked once as kid with a big board in the 6th grade, thanks to 7 zeroes in English and 1 zero in Social Studies, so 8 swats for 8 zeroes. It hurt like the dickens, but it sure made me bring everything up to A's and B's in all classes.
Do you mean to tell us that you were actually spanked for getting poor grades?
Yep. It was the only way my parents could get through to me. The sad thing is it happened just 2 days after my 13th birthday, which was not a happy birthday. I got whacked on May 1, 1995 and by the end of the school year three weeks later, I had gone from having 8 zeroes on my record to all A's and B's. Of course, it helped that my English teacher, the class that I had 7 of the zeroes, gave me a second chance. If it weren't for the spankings and her kindness, I could have failed the sixth grade and been forced to experience the humiliation of graduating high school at age 20.