A month after the rollout of California’s massive effort to issue driver’s licenses to 1.5 million undocumented immigrants, the process is working overall in Los Angeles and the Inland Empire. Still, many applicants report a mixed bag of experiences. Local advocacy groups are scrambling to address overflowing driver’s license preparation classes. Some test-takers are showing up at the Department of Motor Vehicles without studying, and some tech-phobes fear the touch-screen test format that allows four minutes for each question. Language kinks were being untangled last week for Mixteco speakers after confusion over whether translators could assist during the written and...