The Khom Loy Development Foundation, which works with Burmese refugees and ethnic minorities in Northern Thailand has a program to build Montessori preschools for the Hilltribe children in Northern Thailand. Most of these children don’t speak any Thai, but they are required to go to government run schools starting at age 6, where they are at a huge disadvantage because they are taught in Thai. The main goal of the Montessori programs is to help the children learn the basics of Thai, including reading and writing, so that they will be successful in the government-run primary schools. They’re now up to 19 classrooms!
Here is their video. Sadly, it has a lot of talking and not enough (in my opinion) footage of the children working, but it is a fundraising video, primarily.