We did WPPSI and WJ-III for achievement. If you don't need the results till summer than wait. If you need the numbers to start planning for next school year now than you may give it a shot.
Both tests are given by psychologist. Check to Hoagie's site but we were not lucky with that one - long waiting list and didn't even use tests accepted by DYS.
Before you make an appointment make sure that they use a test(s) you want. It may be wise to start shopping around now, because like I said the waiting list may be enormous. Google psychologist, gifted, evaluation and your state and see what you come up with. You can also call gifted schools in CA and ask them whom they use for evaluations.
Good luck
