First, thank you for your question.  Second, I am sorry that you have struggled with ensuring the best education for you child.  There are some basic steps that you can take to ensure that your child is placed in the  best program suited for his needs.  If you have not done so already, make sure that you understand all the assessment results documented in his Individualized Learning Plan so that you know what are his learning strengths and needs.  Then, find out what resources and programs are available in your school district to work with children that have similar needs to your child.  Because of the age of your child, his needs are much more pressing and there should be multiple interventions to help him.  Without knowing what support activities he is currently receiving, I would suggest that you also look beyond the schools for extra assistance.  For example, if your child cannot read, local public libraries, Boys Clubs, Adult Education Classes, Community Colleges, and other community organizations may offer literacy classes.  Enroll him to get extra help after school.  If there is a university near your home, check with their education department, special education department or psychology department to see if they need special needs students for their studies. There are many benefits and support activities for children who participate.  
I would suggest that 'home schooling' ought to be the last choice for your child.  Your child has needs that are complex and may be costly to address, or may need the expertise of a variety of experts.  So, before you decide on this option, you may want to give the schools another opportunity and seek further assistance within your community.