When a student with disabilities exhibits challenging behaviors that interfere with learning, the school may do a Functional Behavior Assessment (FBA), which is a process for understanding when and how the student's problem behaviors tend to arise. The team doing the assessment then recommends a Behavior Intervention Plan (BIP) to address the situation. Parents can, and should, be involved in both these processes.
In considering your own child's behavioral issues, you may want to visit the Think:Kids website, which describes a research-based approach to problem behavior that is new and promising. It is based on the idea that children "act out" because they lack certain kinds of thinking skills - skills like managing transitions between activities and goals, separating emotions from intentions, or working through distractions.