Why did Indian low-caste immigrants take advantage of English and start monopolizing some industries in Canada?

In Canada, language ability is an important job requirement, especially for those who work in business, finance and other fields. English is one of the most widely used languages in the world. For low-caste immigrants from India, their English ability can help them get better employment opportunities and higher income in Canada. In addition, due to India's high level of education and economic development, Indian immigrants usually have a high level of education and professional skills, which makes them competitive in the Canadian job market. Therefore, they can achieve success and monopoly in some industries in Canada.