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ACADEMY OF SINGAPORE TEACHERS 2017 2018 2015 BBC NEWS 2016 2018 2020 2020 48 20 20 455-9 BRASIL 2015 ELOS EDUCACIONAL 2019 2018 2020 FUNDAÇÃO LEMANN 2020 2021 244-55 HERITAGE FOUNDATION 2021 INEP 2020 2006 2013 22 267-77 MEC 2019 NATIONAL INSTITUTE OF EDUCATION NIE PORTUGAL 2011 SINGAPORE. Ministry of education 2020 2017 2021