MANLIUS (AP) - Six high school students and two graduates were charged with hacking into a district computer system and changing their scores on Advance Placement tests, the SATs and classroom examinations.

Police investigators in this affluent Syracuse suburb said the students also gained access to discipline records, health records and other personal information about current and former students at Fayetteville-Manlius High School.

"Whatever modifications or tampering done has been limited in scope. It seems like the students accused of this were self-serving in what they were doing," Executive Principal Jim Chupaila said Wednesday.

The school, however, is in the process of double-checking all its computer records and upgrading its security, he said.

Five current students and a former student now attending Syracuse University were arraigned Tuesday in Manlius Village Court. They were released on their own recognizance after being charged with crimes that include felony counts of computer trespass, tampering with public records, computer tampering, forgery, and attempted burglary.

A sixth current student was charged with misdemeanor conspiracy and given an appearance ticket.

An eighth person was to be charged Saturday. Capt. William Bleyle would only say the person was a freshman at Johns Hopkins University in Baltimore.

Administrators said at least four of the current students were consistently on the high school honor roll and involved in extracurricular activities. Two have been Science Olympiad Team members, and one performed with the high school concert choir and placed second as a member of the Onondaga County Math League team.

"The names surprised us when we were told who was involved," Chupaila said.

The students attached a device that tracks keystrokes to a school computer to obtain administrative passwords and then gained access to the district's computer systems, Bleyle said. Students also were able to get into teachers' personal files and e-mails using stolen passwords, and then found their class tests and answer keys stored on the computer, he said.

Some of the accused students reportedly cheated on the SAT exams, recording answers on calculators, then sharing them with other students, he said.

Several of the students were charged with changing grades, police said.

The incident came to light two weeks ago when one student was caught trying to remove an electronic monitoring device from a school computer. Another student was caught trying to break into the school, and a third student was found waiting in a nearby car.

"The real victims here are the kids at F-M who work hard for their grades," Bleyle said.

The students were suspended and will have disciplinary hearings. Chupaila said student privacy prevented him from commenting on what specific punishment they would receive.

Bleyle said the investigation was continuing.

None of the students or their parents commented at Tuesday's arraignment.

"I'm sure once we get the opportunity to fully review the charges we'll get a clearer picture of what actually occurred up to this point," said defense attorney Steven Cambareri, who is representing one of the students. "The events, I suspect, may be a little different than the one-side version of events presented to the media so far."