Looks like this is decided purely on a local school district basis, as state GT programming was part of the ed law repealed as of fall 2014:

http://www.cde.ca.gov/sp/gt/gt/gatefaqs.asp

Of course, multiple sources of information are always recommended when making placement decisions, but districts can and do make their own choices.

This is what your state recommends:

http://www.cde.ca.gov/sp/gt/gt/documents/guidebook.doc

...pronounced like the long vowel and first letter of the alphabet...