Jacob Scott, 19, of Rix Avenue, Cobden, pleaded guilty in Warrnambool Magistrates Court to dangerous driving causing serious injury and other driving offences.

The court heard he was the driver of a Ford Falcon sedan travelling at excessive speed when it crashed on the Great Ocean Road at Peterborough on New Years Eve.

Scott raced an unidentified Jaguar Land Rover before crossing a solid white line to overtake a white Audi and lost control on a left-hand bend near Old Peterborough Road. The vehicle hit a letterbox before striking a large tree on the passenger side about 11.20pm.

A 20-year-old male passenger was trapped in the car for more than 40 minutes before being freed by State Emergency Service crews.

The passenger was airlifted to a Melbourne hospital with serious injuries, including swelling on the brain, a dislocated shoulder and fractures to his foot, face and sternum.

Detectives from the Victoria police major collision investigation unit attended the scene and located a defect notice on the car.

Scott told police he drove at 180km/h prior to the crash. He was arrested, interviewed, charged and bailed to appear in the Warrnambool Magistrates Court at a later date.

He also pleaded guilty to driving with two females lying under the canopy of a ute nine days earlier on December 22, stealing a bag at the Port Campbell scenic lookout on December 26 and filming himself driving at 200km/h in his step mother's Mazda 3 on December 30.

Then on July 16 and 17 this year, Scott hoon drove a 2012 Toyota Hilux on the Ecklin cricket oval, Cobden Technical School oval and the Timboon Recreation Reserve, causing thousands of dollars worth of damage.

He narrowly avoiding hitting a concrete pole at the Timboon oval.

Scott was arrested after he returned to the oval the following day.

The court heard he was not under the influence of drugs or alcohol at any time.

Lawyer Kyle Eccles said Scott had an "unsettled upbringing" and was diagnosed with post traumatic stress disorder following the New Year's Eve crash.

But police prosecutor Leading Senior Constable Kevin Mullins said the accident that caused that diagnosis happened seven months before Scott hoon drove on three ovals.

Magistrate Michael Coghlan said the man was at considerable risk of an immediate and significant term of imprisonment.

"When it comes down to motor vehicle collisions, many young men like you end up in jail and sometimes serving many years because they killed somebody," he said.

"This is far too common and unnecessary. You, like so many men, think you're a much better driver than you are.

"But you're not a good driver because if you were, you would not have been involved in this."

Scott will be sentenced on Thursday.