Two top school leaders for this liberal city’s school district are frustrated with the state of their education system, they said in a recent interview. San Francisco Unified School District Superintendent Maria Su and Commissioner Supryia Ray told The SF Standard that the district’s outdated materials, persistent student absenteeism, and a chunk of the district’s teachers not instructing students on their new curriculum is “unacceptable.” Su, who was criticized for shedding “crocodile tears” as she dealt with school closures during a February teachers’ strike , said districts that once looked up to SFUSD as the standard are now outperforming them. Su, who was criticized for shedding “crocodile tears” as she dealt with school closures during a February teachers’ strike, said districts that once looked up to SFUSD as the standard are now outperforming them. San Francisco Chronicle via Getty Images The challenges facing the seventh-largest school district in California are large.…