SAN FRANCISCO – When he started high school, Matias Bernal's English was so limited he stumbled over the words for numbers and colors. Four years later, he was on the wait list at Princeton. Bernal is an illegal immigrant from Mexico City. Without access to financial aid, grants and most scholarships, he had to push aside the Ivy League brochures and prepare to attend California State University Fresno, where he can live with family and pay tuition with money from jobs he is not supposed to have. “I was crushed,” he said. About 65,000 illegal immigrants graduate from U.S. high...