they seem to look for alot of things.if you get all the paperwork can you enroll them before term ends then?
Yes its usually up till about 25th May for the next schooly year. If you are wanting them to go in this year before school breaks up in June then you will have to see what the school says. Don't forget that you have to buy all your text books which cost between 200 - 300 euros per child along with stationary so joining the school for a month or two will work out very expensive.
If your children don't speak the language especially the 14 yr old I would use the time with a language teacher to learn as much as they can, this would be more benificial than being in school and not understanding any of the lessons for the last term.
It is difficult for a 14 yr old to go to a new school but for it to be in a foriegn language multiplies the problems they will face, your younger children will adapt in time and are young enough to pick the language up.
If you have the funds maybe consider sending the oldest one to a fee paying international school so its easier for them to settle here.