My first thought would be to identify if the child has an IEP, and - if so - who the person is at school who is in charge of monitoring/managing the IEP, such as the special education teacher. That person would likely have information about instructional and behavioral interventions/modifications to use with this particular child. If not, it may be helpful to pursue a meeting to discuss changes to the child's IEP to include strategies to help the child be successful in your environment.

Another strategy is to talk with the child's parents and ask what strategies they've found to be successful.

I agree with the previous answer, you need to locate the student's IEP and talk with his case load manager. If there is not IEP gather all the data you have on the student including information on the students behavior and try to do a referral for Special Education (this process is different in many places and may require RTI). Using positive behavior supports may be helpful, and having a peer buddy who helps him join in things may be beneficial as well. Also he may just be frustrated because the work you are requiring of him is too difficult, so look into making some accommodations that will help make him a successful student in your classroom. Good luck. You have been given a great opportunity to work with this student.