British Schools that have higher numbers of European migrant students have performed better than the ones without, according to a new research published Thursday.

According to the figures shown by data analyst group School Dash, between 2011 and 2015, the number of non-British and Irish students have increased by only 1.2 percent. However, certain areas have seen an individual increase of 30 percent.

The schools with a larger number of students speaking English as an additional language have shown to perform better rather than putting pressure on the teachers, the Independent reported. The findings underline that the white British students are being outperformed by their ethnic minority classmates. According to the analysis, it is the parents who may be at fault as they do not provide adequate academic assistance to their children.

“On the whole, those schools that have large numbers of non-British white pupils tend to do better than schools that have a smaller number of them,” said Timo Hannay, founder of School Dash.

The analysis, drawn from the data collected from 20,000 schools across Britain, sought to explain the situation in British schools ahead of the Brexit referendum.

The possibility of a Brexit has affected the education industry in Britain in the last few months, with the risk of losing access to funds from the European Investment Bank to build new schools as well as the hiring of native French, German, and Spanish teachers. These situations would worsen the problems around the “migrant salary thresholds.”

The Schools Week reported that according to the analysis, the number of migrant students has not increased uniformly in all schools. In some schools the number of EU migrant kids may have shown a considerable increase, in others the numbers have decreased. Therefore, the impact in hyperlocal.

Hannay said that the since there were no national statistics on European migrant kids in British schools, he used the number of white non-British and non-Irish students for his analysis.