The report, conducted by retired detective superintendent Malcolm Ross, makes 17 recommendations and highlights areas of concern.
The findings have been seen by members of Jack's family, who it is believed are in favour of the report being made public.
And they have been seen by Warwick and Leamington MP James Plaskitt, who has described the report as "pretty critical".
Jack, 17, formerly known as Jack Fisher, went missing in the early hours of December 4 2005 after a night out with friends and was last seen on the riverbank by Adelaide Road bridge.
His body was found several hundred yards downstream on January 3 2006, but a post-mortem proved inconclusive and no one has been charged in connection with the student's death.
An inquest will begin at Leamington Town Hall on March 19.
Licensees, search team members and the last people to see the teenager alive will be among the 30 people giving evidence at the hearing, which is expected to last four days.

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Complaints about the investigation made by Jack's mother and step-father in May 2006 are currently being looked into by Warwickshire Police's professional standards department under the supervision of the Independent Police Complaints Commission.
Following a Freedom of Information Act request and a subsequent appeal made by the Courier, Warwickshire Police has refused to reveal the details of the Ross Report to the press.
Deputy Chief Constable Andy Parker states that releasing the findings of the report:
l would not help resolve the case;
l could hinder the on-going investigation, which is still open; and
l could have an impact on the IPCC investigation.
He also cites the revelation of personal details of officers and police investigation techniques contained in the report could have a negative impact.
In a letter sent to the Courier, the force conceded that releasing the information would aid accountability and public debate about the case but resolved that these factors were outweighed by those which prevented it's release.
Deputy Chief Con Parker said: "It is my view that the circumstances outlined in favour of the disclosure of Mr Ross's report into the public arena do not outweigh the public interest in maintaining the exemptions. I have therefore decided that on this occasion the public interest lies in refusing your request in full."
The police investigation, which cost the force £90,000, included helicopters, sniffer dogs, river-search teams and more than 100 officers and volunteers.
A youth from Lighthorne Heath, then 17, was arrested on suspicion or murder three days after Jack disappeared but was taken off bail in May 2006, after the Crown Prosecution Service decided there was not enough evidence to charge the suspect.
l The Courier has decided to appeal against Warwickshire Police's decision by going to the Information Commissioner.