Ramos was charged Sunday with first-degree premeditated murder and is now being held in a juvenile detention center.
Police say Ramos and his mother got into a bad argument after he came home with a "D" in one of his subjects.
He also implicated two friends, who he said helped him bury his mother and stage a burglary at his home.
Deputies with the Volusia County Sheriff's Office said Gregory Logan Ramos confessed to the crime after originally trying to trick investigators into thinking his home had been burglarized while he was in school. The two other teens are facing undisclosed criminal charges, the sheriff's office said.
"He used his bare hands, which by his estimate, it took him 30 minutes to kill her", he said. Fox News reported that the boy's father was in Seattle on business.
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Detectives found Cleavenger's body in her burial site at River City Church in the early-morning hours Saturday. He told the Daytona Beach News-Journal he agreed with the judge's decision that probable cause existed to detain his client on a murder charge.
"The deputies and detectives who worked through the night and into the morning gave this case absolutely everything they had, and I hope the family knows that Gail has all of us fighting for justice for her", Chitwood said. This suspect "matter of factly" admitted to everything, and said he thought he deserved a "Grammy [sic]" for his performance on the 911 call, Chitwood said.
Investigators say Ramos killed her after they argued about his school grades.
Police responded to reports of the burglary at the home on Friday afternoon. "By all accounts she was an incredible human being", Chitwood said.
Police discovered Cleavenger's body in the church fire pit early Saturday, Newsweek reported. "I have a feeling this is a case we'll be hearing about for years to come", Chitwood said.
But deputies who arrived at the scene were suspicious of Ramos' demeanor and allegedly got him to confess to the crime during an interrogation.