Diversity in the classroom is inevitable. The wonderful thing about working in the special education world is that education is a little bit more individualized than the general education classroom. Even though the diversity in special education might be greater than a normal classroom, it is more individualized. In special education classrooms student's ages and abilities vary immensely. With IEP's and smaller Special Ed classroom containing only 3 to 10 students, teachers are able to focus on individualized level learning.
In the special education classroom I currently work in I see a wide range of students. We have ten year old and twelve year old. Some of the children are very close to grade level intelligence and other are considered MR with limited intelligence skills and often even more limited social skills. The one great thing is that the classrooms are so small we are able to really focus on giving each student. This kind of one on one teaching gives the students the best chance of understanding subjects. The lesson plans vary for each student. We alter lesson plans and testing so that students have the most appropriate ways to show their knowledge.