I was bullied extensively in second grade but not much since then.
There were these twins named Matthew and Heather in my class. They were 8, I was 7. Matthew was a tall robust boy and Heather was tall and had squinty eyes. On my very first day of school, the teacher assigned Matthew to show me around the building, and he was actually pretty nice at first. He quickly showed his true colors though, and did things like shoving me down in the schoolyard, ramming snowballs down my shirt, throwing things at me, and saying verbal obscenities. Heather didn't really do many physical attacks on me unless I was an easy target, such as if standing on ice or having my back turned, but she made up for it by being more verbally abusive than her brother.
I had a friend named Trevor, who was 10. He acted as my bodyguard. He was very tall, probably the tallest kid in class. He would beat the crap out of Matthew within reason if he tried to harm me while Trevor was watching. However, my teacher was of no help whatsoever. I would tell her about what Matthew was doing and she'd just tell me to ask them nicely to stop. I went to my parents who would call the teacher as well as the school, but they more or less told my parents that I deserved it because I got in trouble too. Trouble was a tight definition though. I only repeated things that I saw other kids say or do. I didn't have any discretion of doing it in front of teachers though, since I didn't even know when I did something wrong.
Long story short, I didn't stay at that school for very long.