A school may cancel the I-20 of a student who demonstrates that they do not know sufficent English to continue studies. The the test is: How do you spell cancel? If you answer "cancle" then you are out. If you capitalize school unless you mention the name of a particular school, then you are also out. If you spell student as "studnt", that is three strikes against you and you will definitely be cancelled. When you have learned enough English you may be invited back but your chances are slim to none. This is a very short test but an effective way of riding the campus of people who do not demonstrate capacity for higher learning.