Is this normal practice. I have given them 5 months notice,but they are saying its not a full term 9based on contract i signed).
I think its quite normal for most schools that you pay a term' s fees if you take up a place and then decides you dont want it. You really have to read the terms properly and their defination of a term could be different from state school one and therefore why it may not be 9 weeks as you calculate it.
I am sure I would too HATE to pay that but playing devils advocate what did you expect the school to do? Imagine they now have to find someone to take your DC's place and they could have let other people down who really wanted the school but may not need the place now.