The rankings were created by a team of experts to help make a country-by-country assessment of the best universities in each country.
They looked at more than 1,000 academic disciplines from over 100 countries.
The top 25 countries by total student enrolment in science, technology, engineering and maths (STEM) have been announced.
The United States, which had the highest total number of students, topped the list of universities in the US, followed by Japan and Australia.
The UK was the next most popular country to study.
China topped the ranking with a total of 3,942,879 students, followed closely by the United States at 2,846,977, followed at a distant third by Canada at 2.5 million.
Australia and New Zealand followed with 1,094,092 and 1,002,739 students respectively.
Top 10 countries by number of enrolments in STEM subjects (in millions) in 2019 (top 25)Rank country Total enrolment 1 Japan 1,844,947 2 China 1,929,971 3 United States 1,744,897 4 United Kingdom 1,634,853 5 United States 991,852 6 United States 873,072 7 Canada 905,842 8 Germany 904,836 9 United States 685,945 10 Australia 664,849The top 10 countries for student enrolments according to the 2017 rankingsThe United Kingdom, which has a population of over 200 million people, is the world’s biggest economy.
Its economy has grown by 8.4 per cent over the past three years, while it is the second largest in the world.
The country has also been the subject of much speculation in recent years, after reports suggested that it was becoming increasingly less open to foreign investment and a number of high-profile suicides, including a school teacher who took his own life in October.
The BBC is not naming the person who wrote the letter, and said it was not an official official statement.
It is also unclear why Japan had the number of international students at the top of the list, but the country has the highest number of foreign students in the OECD.
It is also the country with the most foreign students per capita, which can be seen as a key indicator of the strength of the economy.
However, Japan also has a relatively high level of inequality in the country.
The number of people in poverty in Japan is almost three times higher than the OECD average.
It was not immediately clear what the reason for the United Kingdom being the top destination for students was.
The top 25 ranking in STEM in 2020Top 25 countries for total student enrollment in STEM disciplines (in million) in 2020Rank countryTotal enrolment1 Japan 2,944,847 2 United States 2,746,892 3 United Kingdom 2,632,972 4 United States 794,742 5 United Kingdom 757,569 6 Australia 658,869 7 Canada 644,893 8 Germany 634,946 9 United Kingdom 618,948 10 Australia 590,872Source: BBC News’ rankings of the world top universities, 2018-2019