I used to tutor children from IS and BSM and I never noticed any of them mentioning any physical bullying. Albeit, they weren't high schoolers or anything, that's typically where the bad physical bullying goes down. My guess is that all around, the bullying is minimal at best.
I'm not from any International school. But I'm pretty sure that the teachers and principals of all schools, International ones included are against bullying especially that there's now an anti-bullying law: http://www.gov.ph/2013/09/12/republic-act-no-10627/
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