LADERA RANCH – The two young men sport neckties and smiles in their  high school yearbook photos – two bright-looking seniors who appear  prepared for whatever college and life beyond has in store for them.

Omar Khan, 18, beams in another photo as a member of the National Honor Society at Tesoro High School.

Tanvir Singh, also 18, poses with officers of the Associated Student Body.

Under his senior portrait, Singh included a favorite quote from Mark Twain:

"Don't let schooling get in the way of your education."

Today,  those words took on a ominous tone as the community of Tesoro High  School continued to absorb news of the two young men's alleged role in  a scheme to cheat on tests and change school grades.

Relatives  and attorneys representing Khan and Singh declined to comment in detail  today on what authorities allege was a series of serious crimes  committed between Jan. 23 and May 20 at the high school located in the  foothills on south Orange County.

Some experts and local high  school counselors said it's unclear what might have motivated the two  teens, but the pressure to succeed in high school is higher today than  ever before.

"A lot of times, parents don't realize just how  stressed out their children are," said Jacquie Morck, the head  counselor at Troy High in Fullerton, one of the county's top performing  schools.

"Often, the most pressure comes from parents  themselves. That's why it's important for teachers and counselors to  bring parents in whenever it appears that a student is overwhelmed,"  she said.

Denise Pope, a lecturer at Stanford University, who  wrote the book "Doing School: How We Are Creating a Generation of  Stressed-Out, Materialistic, and Miseducated Students," said both  parents and students often believe the misconception that a student  needs to earn straight As and go to an Ivy League-type school to lead a  successful life.

"There are multiple paths to success," she  said. "I've met so many students who started out at a community college  before transferring to four-year schools and eventually became top  scientists or doctors."

Khan, who authorities say lives in Coto  de Caza, has been charged with 69 felony counts, including altering  public records, unauthorized computer access and fraud, burglary,  identity theft and conspiracy.

Singh, who lives behind gates in  the Covenant Hills community of Ladera Ranch, has been charged with  four counts of conspiracy, burglary, computer fraud and attempted  altering of a public record after he allegedly tried to break into a  classroom to steal a test in advance of an exam.

Arraignment for  both Khan and Singh has been set for July 8. Khan, released Tuesday on  $50,000 bail, made a brief court appearance today at the Harbor Justice  Center in Newport Beach. He arrived in court wearing a crisp brown suit  accompanied by family members. Singh appeared in court Wednesday.

Khan  could be sentenced to up to 38 years of prison if convicted, while  Singh faces a possible three years in prison. Both students were  supposed to graduate with their class Wednesday.

Efforts to reach Khan at his home in Coto de Caza were unsuccessful today.

A  man who answered the door at one of two addresses in Ladera Ranch that  appear to be connected to Singh said he would not comment on the case.

A  man who answered the door at the estate in Covenant Hills where Singh  is believed to be living with his mother and step-father refused to  comment.

Tesoro senior Tommy Vail said Singh was a friend and described him as funny and very mellow.

"When I heard about this it hurt me," Vail said. "He was accepted to UCSD and I saw all this potential just lost."