If you can afford to have him tested do it!
This statement may very well turn into my battle cry because I truly, truly, no doubt in my heart or mind, believe it was the absolute best thing we ever spent money on for our DD. You can see my other posts for more of an explanation on what we've been through so I won't go into all that, but I know where you are coming from - gather your armor and prepare yourself for battle!
Also - look up California's Department of Education website and educate yourself on the laws and parent's rights.