rainbow international montessori in khairatabad. is it montessori all the way up?

i pass it on the way to a site in khairatabad and always wonder. the name says montessori but it goes up to class 10 on the state board. do the older classes still work the montessori way, mixed ages, materials and all that, or is it mostly the little ones and then a regular classroom from class 1? not planning anything, my daughter's settled in her school. just curious what that looks like in a bigger school.