Mindfulness has been proven to reduce anxiety, improve attention, increase compassion, and improve ability to regulate emotions https://www.mindfulschools.org/about-mindfulness/research/
Tons of research on the benefits of mindfulness for adolescents here: https://greatergood.berkeley.edu/article/item/mindfulness_in_education_research_highlights
This article in The Atlantic from 2015 has lots of links to the benefits of mindfulness as well as an interview with a teacher who currently use mindfulness in his classroom at a high school in the Bronx: When Mindfulness Meets the Classroom by Lauren Cassani Davis
Mindfulness may even help to reduce implicit bias; by becoming more aware of our thoughts, emotions, and surroundings, we can work to counteract the implicit biases we have developed. Read this article by Rhonda Magee from 2015 to find out more: How Mindfulness Can Defeat Racial Bias
Schools that implement Restorative Practices with high fidelity are showing almost unbelievable benefits. The evidence can be found everywhere from increased empathy to increased test scores, from decreased suspensions to decreased drop out rates. It has also been found effective in reducing that racial discipline gap.
Jain, S., Bassey, H. Brown, M., & Kalra, P. (2014). Restorative Justice in Oakland Schools: Implementation and Impacts
The Promise of Restorative Practices to Transform Teacher-Student Relationships and Achieve Equity in School Discipline Journal of Educational and Psychological Consultation, vol 26, 2016, issue 4: Restorative Justice, p. 325-353.
Joie D. Acosta, Matthew Chinman, Patricia Ebener, Andrea Phillips, Lea Xenakis & Patrick S. Malone (2016) A Cluster-Randomized Trial of Restorative Practices: An Illustration to Spur High-Quality Research and Evaluation, Journal of Educational and Psychological Consultation, 26:4, 413-430, DOI: 10.1080/10474412.2016.1217488
Circle in the Square by Nancy Riestenberg
Circle Forward by Carolyn Boyes-Watson and Kay Pranis
Source: Restorative Justice in Oakland Schools: Implementation and Impact https://www.ousd.org/cms/lib/CA01001176/Centricity/Domain/134/OUSD-RJ%20Report%20revised%20Final.pdf