I’m a teacher (despite/as well as my name)
Running in corridors instead of being in class
Not sure what is meant, children forgetting and running inside is normal (especially after lockdown!), being reminded to walk each time is normal. Children running around uncontrollably isn’t normal.
Swearing at teacher
Not normal
Same children removed from class daily
Common if not normal
Fighting
Depends what is meant by this. Disagreements are normal, occasionally pushing does happen. But punching isn’t normal.
Understaffed since covid
Normal 
Promised pastoral care that then doesn't happen as staff off
I hate to say normal, but we are struggling with this as no budget for supply 
10 percent off a class Sen
Very normal
One Ta to a class of 10 percent Sen mostly add/ADHD diagnosed
Very normal. Some schools have no TAs outside of early years and lunch cover.
Sounds like you are worried about your child. Best approach is to contact the school, focus your concerns about them and how they are finding situations difficult or are not thriving. If promised pastoral interventions aren’t happening they absolutely should be explaining why to you. I email to parents (I’m a SENDco) to apologise and give a brief explanation. Even if I can’t always magic up staff, I can at least have the courtesy to make parents aware that there was a situation beyond our control and we do intend to resume the intervention as soon as possible.