Bullying in schools

All 3 of my kids have been bullied and the youngest is only 5 and in her first term at “proper school” andI have moved the eldest from one senior school because he kept getting beaten up and the middle one snapped in the end and fought back
but when I went in to the school’s to try and sort it out I got little or no help
the youngest has actually been told off for being in the same area as him when they were told by another teacher to work on the same thing and they had already heard this boy saying he would like to cut her up with a knife.
so I have no faith whatsoever in the schools sorting any bullying issues out

pam