Have you read the paper or the link summarizing the paper? It is based on a 2002 questionnaire sent to teachers that showed teachers had a more positive impression of Asian-American than white students while only speculating on why that should be the case. Could it be because the Asian students as a group work harder and teachers like that work ethic? Well let’s see if that is plausible.
In a 2014, data from two longitudinal studies were analyzed. One followed about 1600 white and Asian students from Kindergarten to the 8th grade. The other followed about 3600 white and Asian students through high school (9th-12th grades). The same conclusions were found for both studies:
We find that the Asian-American educational advantage over whites is attributable mainly to Asian students exerting greater academic effort and not to advantages in tested cognitive abilities or socio-demographics. https://www.pnas.org/doi/10.1073/pnas.1406402111
A follow up paper by the same authors support their original results:
We use Education [Longitudinal Study (ELS) 2002 baseline data to test our proposition that the cultural orientation of Asian American families is different from that of white American families in ways that mediate the effects of family SES on children’s academic achievement. The results support our hypothesis. Why do Asian Americans academically outperform Whites? – The cultural explanation revisited - ScienceDirect
Another study tested math and science skills of students in Kindergarten, largely eliminating the influence of teachers. The results were:
Racial and ethnic disparities in advanced math and science skills occur far earlier in the U.S. than previously known. Our new study finds that 13% of white students and 16% of Asian students display advanced math skills by kindergarten. The contrasting percentage for both Black and Hispanic students is 4%. Disparities in advanced math and science skills begin by kindergarten
Strongly suggests that Asian parents are making a greater effort to teach their kids math and science at a very early age.
In summary, the best available evidence indicates that Asian-American students on average work harder than their peers in academics and are better prepared for math and science starting as early as Kindergarten. They earned the respect of their teachers. That’s not bias. That’s merit-based appreciation. When it comes to academic achievement, Asian Americans (and Ashkenazi Jews) may have a cultural advantage over other groups.
This similarity between groups has long been noticed (unfortunately behind paywall):
Factors Contributing to the Academic Excellence of American Jewish and Asian Students https://www.jstor.org/stable/2112761