Students at the school were told of 13-year-old Joshua Roberson's death during fifth period classes Tuesday.
Principal Pam Chavira said students were offered the opportunity to speak with school counselors and psychologists on Wednesday. Some students chose to meet with them individually while others did so in groups.
"On the whole, I would say they have been very mature," Chavira said.
Counseling services were also made available for parents and teachers.
Joshua died Monday night after the car he and his mother, Crysteline Malone, 49, were traveling in was broadsided by a pickup in a crash at Campus Avenue and Arrow Highway.
Joshua died at the scene while his mother was taken to Arrowhead Regional Medical Center in Colton.
Family members requested that no information on Malone's condition be released, hospital spokeswoman Justine Rodriguez said Wednesday.
Upland police officers said the driver of the pickup left the scene of the crash on foot, but they were able to trace ownership of the vehicle to Kyle Bahensky, 21, of Ontario.
Police officers went to Bahensky's home and arrested him early Tuesday on suspicion of felony hit-and-run.
He was booked into West Valley Detention Center in Rancho Cucamonga and was
Upland police Lt. Eleno Arriaga said Wednesday investigators plan to present their case to the District Attorney's Office this morning.
Investigators will "have them review it and see if any other charges will be filed," he said.
Police officers are trying to determine how fast the pickup was traveling at the time of the crash, Arriaga said.
Bahensky's car was headed south on Campus when it broadsided Malone's car, traveling west on Arrow Highway, police said.
The impact sent the sedan that Joshua and his mother were traveling in into a carport, which then partially collapsed.
The car caught on fire but police officers were able to put it out with fire extinguishers.
At Upland Junior High, Chavira, who took over the principal's responsibilities this academic year, said she didn't know Joshua but others at the school described him as "a very friendly, very likable young man" who would often stop in the classrooms of his former teachers to say hello.
Joshua, the youngest child in his family, was an above-average student who had enrolled in an after-school program at the school this year.
The program offers homework assistance and other activities for students.
Joshua wanted to be in the program last year but wasn't able to get in until this academic year "and was so happy to be here," Chavira said.
Although the school doesn't have sports, Joshua was known to be an avid basketball player, she said.
Some students at Upland Junior High School have approached Chavira and would like to establish a memorial for Joshua, possibly by planting a tree on campus, she said.
Chavira said she made a commitment to students to look into the matter and determine what Upland Unified School District's policy is on such matters.
Contact Monica via email or by phone at 909-483-9336.