To check if your school is a TRUE MONTESSORI ask then to show their accreditation/affiliation through American Montessori Society (AMS) or AMI (Association Montessori International) or MACTE .

Montessori preschool Classroom Traditional(Child care, daycare,preschool) Classroom Prepared kinesthetic materials with incorporated control of error, specially developed reference materials Textbooks, pencil and paper, worksheets and dittos Working and learning matched to the social development of the child Working and learning without emphasis on social development Unified, internationally developed curriculum Narrow, unit-driven curriculum Integrated subjects and learning based on developmental psychology Individual subjects Uninterrupted work cycles
Block time, period lessons Multi-age classrooms Single-graded classrooms Students active, talking, with periods of spontaneous quiet, freedom to move Students passive, quiet, in desks School meets needs of students Students fit mold of school Special help comes to students Students leave for special help Process-focused assessment, skills checklists, mastery benchmarks Product-focused report cards

From the Montessori Foundation,