Answer:
To pass the test, a student must correctly answer at least 0.6 or 60% of the questions.
Donald's score is 5/8, which can be simplified to 0.625. Since this is greater than 0.6, Donald passes the test.
Karen's score is 0.88, which is greater than 0.6, so Karen passes the test.
Geno's score is 3/5, which can be simplified to 0.6. Since this is equal to 0.6, Geno passes the test.
Ciara's score is 4/5, which can be simplified to 0.8. Since this is greater than 0.6, Ciara passes the test.
Therefore, all the students pass the test.