First of all--my heart goes to you! It sounds super stressful! Spring break is coming up... how about having a week of "pretend homeschooling" to see how he would do? Someone suggested that you talk to him about how homeschooling could be, and I second that. Once you have the discussion, have a trial run during spring break and see how both of you like it.
Another suggestion is to check out some basic behavioral things or programs to use on a consistent basis. I love the "love and logic programs". He must be very frustrated-- to be violent. So it is very important that you have all the tools to help him learn a healthier manner of expressing his frustration.
I hope things improve soon. `
