a diploma is an indication of a student's mastery of key information <and not> just a piece of paper

park sang joon

Senior Member
Korean
The tests ensure that a diploma is an accurate indication of a student's mastery of key information and not just a piece of paper signifying twelve years of school attendance. Polls show that only 23 percent of college professors and 41 percent of employers believe that a diploma reflects a student's knowledge and abilities. But when a diploma is backed by successful completion of exit exam, the value of diploma is reinstated, for it proves actual achievement.
[Source: Reading for Results Ninth Edition by Laraine Flemming]
I'd like to know if I can replace "and" with a comma.
 
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