A Brentwood High School sophomore who returned to the United States from El Salvador in 2014 is challenging himself inside and outside the classroom.

Diego Montes, 18, has maintained a 90 grade-point average since moving to Long Island to live with his aunt, uncle and cousins to pursue a better life. He transferred to regular English classes after eight months of being in the school’s bilingual program.

He also works up to 17 hours a week at a local McDonald’s to send money to his mother and three younger siblings in El Salvador to build a new house.

Montes’ efforts earned him his school’s “Student of the Month” award for December.

“I definitely love living here because I have a lot of opportunities I didn’t have in El Salvador,” Montes said. “I really want to challenge myself. I said, ‘It’s go hard or go home.’ ”

Montes was born in California, but his mother took him to El Salvador when she returned there. He was only 8 months old, he said.

In addition to classes and work, Montes teaches English to one of his sisters when they talk on the phone or via the computer.

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“He’s taking advantage of all this country has to offer,” said Maria Trujillo, a Spanish teacher at the high school.