MULTAN, Pakistan—Tashfeen Malik, who went on a deadly shooting spree in California with her husband last week, studied after college at a conservative Islamic religious school here that attracts relatively well-educated and affluent women.

Officials at the Al-Huda International school said Ms. Malik took classes on the Quran for about a year until May 2014—two months before she moved to the U.S. and married a Pakistani-American man, Syed Rizwan Farook.

Earlier...