The only person to serve two non-consecutive terms as u. s. president was known by what nickname?

Stephen Grover Cleveland

Explanation:

Stephen Grover Cleveland, the 22nd American president was the only president of The United States that served two terms that are not in direct succession between 1885–1889 and 1893–1897.  

"His Obstinacy" was his nickname because he vetoed more bills than the combined efforts of the first 21 presidents of America.  

At the time he weighed over 250 pounds, he was called “Big steve” by his friends due to his body size.

When he scaled through the bar exam to assume the position of district attorney for Erie County and later sheriff and New York Governor, he earned “Uncle Jumbo” as nickname .

the numbers are even higher.

explanation:

statistics have shown that more that 60% of test takers fail the first time and have to retake the test.