SACRAMENTO, Calif. (AP) — California is on track to collect $4 billion more in personal income taxes than Gov. Jerry Brown had expected, giving a potential boost to education funding. The Legislative Analyst's Office said Tuesday that the state has been posting strong tax collections so far this fiscal year. Personal income taxes are the state's largest revenue source. The current fiscal year ends June 30. California had two huge tax collection days since the April 15 filing deadline. That came on top of a strong revenue month in January. Even so, Brown cautioned that the extra money may already be committed. He and the legislative analyst noted that much or all of the extra revenue will likely be required to go to public schools and community colleges.