Funny thing is my mother used to recommend "just ignoring them" to deal with bullying when I was a kid.
Not that such advice ever meant much since it isn't something one can really just ignore. It was shit advice in pretty much every regard.
Others suggested mentioning it to teachers or whatever, but I refused to demean myself by going to them for help (plus I hated most of them).
My own way of "dealing" with bullies was kinda different. Possibly even insane, depending on your perspective. I mean I'd try to stealthily avoid them if they hadn't noticed me... but when they did target me I'd just... taunt them. Constantly. Even while they were kicking me on the floor I'd mock them for being too fucking stupid to express themselves in any other way, and reminding them of how their academic failings would probably ruin their lives... and how they might as well just kill themselves to save the time and trouble... etc.
Eventually it stopped. Which is to say I actually did get a reputation for being completely insane, and that was when even the bullies started leaving me alone. Might have been when I told one of them I'd track down where he lived and kill him in his sleep when he least expected it.