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The Cornelius Vanderbilt Elementary School, also known as PS 14, may be in trouble. It got a "C" on its latest report card, to the surprise of parents.

"It's a very good school. And I'm glad I send my daughter here," said PS 14 parent Jennifer Negron.

In fact, nearly 99 percent of Staten Island's elementary and middle schools saw their grades drop when the Department of Education gave out report cards Thursday. It was the biggest drop of any borough.

PS 14 was one of 30 Staten Island schools to get a "C" this year. Twenty others received a "B" grade, and just four earned an "A."

In the 2008-2009 school year, PS 14 scored an "A" overall. If not for a Department of Education rule that doesn't allow schools that performed well the year before to drop below a "C," PS 14 would have failed in the 2009-2010 school year.

"It's also a wake-up call. If a school went from an 'A' to a 'C,' that means that there's really some work to be done in that school," said Shael Suransky of the New York City Department of Education.

In many cases, school grades fell because of a drop in student scores on state tests. The state last year toughened testing standards after finding it was too easy for students to pass. While many parents remained supportive of the school, students at PS 14 said if their own grades had dropped from an "A" to a "C" they would definitely be in trouble with their parents.

"They would probably be angry at me, so, they would just probably be angry at me," said PS 14 student Tahriq Logan.

"Would probably just get me in trouble -- grounded for a month," said PS 14 student Terrelle Thompson.

While being grounded might be the answer for students, it's unclear what the answer is for administrators at the school.