The Cyber Crimes bureau of the Los Angeles Sheriff's Department is working closely with the school to investigate how the unauthorized access of the school network could have taken place.
"We are very confident that we have the ability to restore all of the impacted scores. Teachers have been contacted and will be reviewing their student's grades for accuracy," said Principal Michael Kelly.
This is not the first recent incident in California after a student of Dixon High School in north California was also arrested earlier for unauthorized access to his school network.
Students whose grades were changed were interviewed by the authorities and some of them were suspended while the grades of all are being reverted back.
The teachers will be reviewing the grades again to make sure that the original grade is given to each student.
