"Maybe Chinese children are thriving as they aren’t represented in the media as ‘thugs’ or in academia as slaves..."
I think the usual explanation is a family and cultural background with extremely high expectations regarding education and aspirations
^^This.
Also, from a research project from Lambeth LA - "The reasons for the underachievement of Black Caribbean pupils are wide‐ranging and complex. ‘Withineducation literature recently four main school ‐related factors have emerged: stereotyping; teachers’ low expectations; exclusions and headteachers’ poor leadership on equality issues. All of these can perpetuate low attainment and disengagement from learning by Black Caribbean students’ (Demie 2003:243). Other
researchers also noted that the lack of adequate support to schools from parents, economic deprivation, poor housing and home circumstances (Rampton 181, Swann 1985); teachers low expectations by entering for lower or foundation tier or ability groupings (Gillborn and Youdell 2000, Strand 2012), institutional racism and the failure of the national curriculum to reflect adequately the needs of a diverse and multi ethnic society (MacPherson 1999, Gillborn 2000); lack of targeted support and negative peer pressure
(Demie 2003, GLA, 2004).
Overall the body of available research suggests a worrying picture of a failure to address the underachievement of at least three generations of Black Caribbean pupils in British schools. There is an
urgent need to increase our understanding of the factors which lie behind this underachievement"
There are far more factors into why as a group they may be underachieving, and it;s not just down to not being able to engage with the NC. I can imagine it would help - but without addressing all the other factors, nothing much is going to be able to change without radical intervention/changing of both the curriculum, atitudes, and innate views.