Which tutorial centres administer ISEB tests?

[newtothis15]

My DS needs to sit iseb test. Which tutorial centres administer this test ? Thank you.

Aren't they sat at the schools (either current or future)?

I think they are only done in schools unless overseas. Won't one of your target schools host him/her?

the host school says they can do it but it will be all in 1 day!

That sounds normal. Can target school not advise you?