The administration of the outgoing President Donald Trump in the United States has made changes to the test that immigrants have to pass in order to obtain citizenship of the country.
The New York Times reports.
A new trial was introduced this week.
It is longer than the previous ones, and respondents should get 12 out of 20 questions correctly.
In the past, six out of ten were required to pass.
Easy questions have been removed from the list of possible questions, and the layout of the questions has been complicated so that the respondent can easily go to the lever if he does not consider the question carefully.
The revised test in particular can be difficult for those whose English language skills may not be good enough.