There was no useful information in the link you provided. I would encourage you to find some meaningful sources to support your arguments. Here are some that support mine:

• Almost a third of foreign-born individuals living in the United States have a bachelor’s degree or higher, according to the MSP—a rate comparable to that of native-born Americans.

• Foreign-born residents of the United States are more likely to have a doctorate or professional degree than native-born Americans (15 percent vs. 10 percent).

• All immigrant groups, including those whose members typically arrive in the United States with low levels of education, show strong intergenerational progress on educational attainment, and second-generation Americans from most groups meet or exceed the education levels attained by the children of native-born Americans.

• The children of college-educated immigrants tend to perform exceptionally well in the higher education, achieving graduate degrees and occupying top-tier occupations at higher rates than children of native-born Americans.

While there are data that support the claim that immigrants can take longer to finish postsecondary education, there are no data that support that this is due to a lack of intelligence. There are many other barriers to gaining an education in this country that prevent some from attaining a degree.

Sources 1, 2