https://phys.org/news/2018-07-certification-standards-critical-social-workers.html

School social workers are trained professionals who provide key services related to a student's well-being across multiple systems. While counselors work one-on-one with students, social workers also work with teachers, family members and community groups to help at-risk students be more successful. They also know how to research interventions that can decrease problematic behaviors and can choose the best intervention for the student. Social workers often can help children with the most severe issues by acting as their advocate. In typical settings, school social workers can provide intensive support for 25-30 at-risk youth at a time.

Thompson looked at nearly 4,000 profiles of school social workers from all 50 states to determine the quality of their work in the schools. Three profiles emerged from the analysis— high, medium and low levels of ecological practice, or engaging with all facets of a student's life. High- performing social workers were more likely to use school, family and community support practices. He also found that those with graduate degrees in social work were more likely to engage in these practices. However, timing of the education mattered, as social workers who had more recent education, within 10 years, were more likely to be trained in the best evidence-based practices.