An advantage of the Montessori approach, including multi-age classrooms with students of varying abilities and interests, is that it allows each child to work at her own pace. Students whose strengths and interests propel them to higher levels of learning can find intellectual challenges without being separated from their peers. The same is true for students who may need extra guidance and support: each can progress through the curriculum at their own comfortable pace, without feeling pressure to “catch up.”
We might note that from a Montessori perspective, every child is considered gifted, each in her way. Every child has their unique strengths, it is all a matter of degree.