A former Diablo Valley College student worker, who is the accused ringleader of a computer fraud scandal where he allegedly changed grades for several students — including one from SF State who paid more than $4,000 to have 15 grades doctored — plead guilty to 15 felony counts on Tuesday.

Julian Revilleza, who was arrested in July on his current campus California Polytechnic University, San Luis Obispo, was facing 23 felony counts and had his four-year state prison sentence suspended in Contra Costa County Superior Court Tuesday, District Attorney Dodie Katague said. Revilleza, 26 of Pittsburg, will serve one year in county jail. Katague said he now expects to add 21 more students to the list of the 34 that have already been charged.

“Part of the deal is that Mr. Revilleza cooperate with us,” Katague said Wednesday morning.

Thirty-one students have been arrested in the case that stemmed from grade changes in the DVC Admissions and Records Office, where Revilleza worked. Among the 31, eight have been linked to SF State and the university has put a hold on the students’ transcripts after receiving corrected transcripts from DVC officials in August.

Former SF State student Christopher MacAtulad, who plead not guilty to one felony count to conspire on Sept. 17, took out $4,000 in credit card cash advances to pay Revilleza for 15 grade changes, according to prosecutors. MacAtulad used his phony transcript to transfer to SF State after the fall 2006 semester, a complaint filed by the District Attorney Office in July stated.

Revilleza, who was held in lieu of $250,000 bail, was hired as a general office clerk in October 2004, according to board reports from the Contra Costa Community College District and worked alongside Jeremy Tato, Erick Martinez and Ron Nixon, who have also been named in the case.

According to prosecutors, Revilleza gained access at DVC to complete grade change requests from paying customers. DVC and CCCCD officials have since changed the amount of individuals who have access to grades from around 90 to 10.

McAtulad is scheduled to appear in Martinez on Oct. 3 to set a date for preliminary hearing. The Pittsburg resident waived his right to a speedy trial at his Sept. 17 arraignment.