Montessori establishes habits of concentration, perseverance and thoroughness in the early years which then, in turn, produces a competent, and confident learner in the later years. Armed with these qualities the Montessori child eases into mainstream classrooms adapting easily and quickly to their new routine.
By age five, Montessori children are normally curious, self-confident learners who look forward to going to school. They are normally engaged, enthusiastic learners who honestly want to learn and who ask excellent questions. They were treated with honesty and respect. While there were clear expectations and ground rules, within that framework, their opinions and questions were taken quite seriously.
There is nothing inherent in Montessori that causes children to have a hard time if they are transferred to traditional schools. But most adapt to their new setting fairly quickly, making new friends, and succeeding within the definition of success understood in their new school.