Because it is impossible for one teacher to help everyone at once, there is at least one teacher's aid in the room. That way, the small group can focus on the extra help they need while the rest of the class can learn some additional information, review old material, or start something new. With more than one teacher in the room, everyone gets the extra attention they need. In a mainstreamed classroom, teachers and aids use special teaching methods. For example, in a mainstreamed social studies class, you could watch a video on Russian geography, get into groups with other kids to simulate living in Russia, and then have personal attention when you write a journal entry about life as a kid in Russia.
Mainstreamed classrooms have specialized equipment and learning materials on hand.
There might be a variety of books for different reading levels, you might see some kids with Alphasmart laptop computers that help with spelling, or there might be a special area to accommodate a kid who uses a wheelchair. For specific medical advice, diagnoses, and treatment, consult your doctor.