Which Monty school do you mean, Mike? Depending on where in Stgo you are planning on living and if you will have a car, maybe this one?
http://epullay.cl/ I was seriously thinking of sending my 2 girls there (4yo and 2yo) but the commute would be an hour each day, plus the tour/interview is all in Spanish so I decided not to.
I ended up choosing Runningbrook instead. It is an infant jardin, day to day the language used is English, the staff are all Chilean, 99.9% of the children speak Spanish as a 1st language and it truly is the language of the playground.
The Jardin starts at the beginning of March, my 2 attended the summer school in January and as my 2 had never been to anything resembling jardin, I was there watching in the classroom for the whole 3 weeks (minus half an hour a day in the last week). It is a great school, and the El Rodeo jardin has a class for 5yo's. They have 2 (from memory) Spanish lessons per week. They also have a school bus which can collect and drop off the children if required, which may help you if you end up sending the children to different schools.
The fees - just shy of $200k per child per month. The matricula (one off fee) was around $200k also. Then you also need to provide an apron for painting/messy stuff and 6 rolls of paper towel per child per year. Class commences at 8.30 and finishes at 12.30, with an option (free of charge) for the children to stay until 1.30. They do not provide snacks/lunch. If your child stays til 1.30 you are required to provide lunch. During term time each teacher holds a class after jardin finishes, which could be dance/painting/cooking/drama etc. This is until 3.30 and costs around 20k per type of class per term. It is optional. There is a uniform, which is inexpensive ($5 USD for shorts, similar for polo shirt). The adult to child ratio is great, typically 2 teachers and 2 helpers per class of 20ish. The children spent most of their time outside in the playground, which has grass! (rare here from what I have seen). The days schedule is broken up evenly so the outside time is not all in one go.
The owner/director Jacquie is marvellous, very knowledgable and passionate about childrens education, she is very well read on the subject, and she has worked in the US. She and her staff truly care about the children, the staff undergo regular training also. In her words (paraphrased) she is unlearning the teachers typical cultural beliefs about a childs "place" and how to respond when a child is upset/acting out. I am really happy with the jardin as are the other parents I have spoken to.
runningbrook.cl
hth