There are plenty of different schools that have a good teacher to student ratio. Montessori is great for some students and not so for others. If your son isn't doing well in a public school/traditional school setting, it might be really good for him.
Generally Montessori method is good for creative thinkers and others. But Creative thinkers are often stifled in a traditional setting, and so Montessori can be a good learning situation for them. Read through the links I will provide. Then use the feature here at GreatSchools, in the upper right of the web page, to search for a school in your area. To do this, select the 'Schools' radio button, then enter the city or school name and state and hit the 'Go' button. From there, you can refine your search further I believe. If the school is a charter or public, you will see reviews based on the scores the school gets from standardized testing, as well as teacher/student ratios, spending per pupil, and graphs that breakdown the ethnicity of the school as well as more. You can also read reviews from parents (providing that parents from that school have actually given their input). Private schools are not required to give out the information about scores, spending, etc... so you might not see that. It's purely voluntary if it's private. But you can see parent reviews even for private schools (as long as parents have reviewed the school).
I hope you find the right fit for your son. I should warn you that not all Montessori schools follow the Montessori Method well. Some make big claims and don't follow through. You should preview each school in person. Walk through ALL the classrooms and see how they are. But sit and observe a class in progress (the grade that your son would be entering). See how things are done. Classrooms should be brightly lit with big windows and skylights. There should be LOTS of manipulatives around the classroom. These are hands-on tools for the children to use to aid their learning. There should be brightly colored objects and for younger grades there should be tools to help with hand/eye coordination.
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