Depending on which state (or even country) you reside in, the requirements will vary. If you live in the US, each state has a wonderful website with all of the curriculum. Even though I have not looked else where, I am sure that other countries do similar things.

Basically, because that is middle school level, I would work on beginning algebra, beginning science, basic history, etc.

Good luck!

Thank u my son is in Puerto Rico where can I go to find the websites for each states. Thank you

Here is an entire website dedicated to Q and A to homeschooling in Puerto Rico:
http://www.hslda.org/default.aspx

Because it is a US Territory, you could go off of any curriculum you choose to. Please search up information about testing that he may encounter to receive his diploma.