Two former St Kevin's College students say they approached senior staff to warn of a sexist, "hypermasculine" culture within the Melbourne school last year, but believe little was done to address the problem.

Key points: Two students wrote a letter last year complaining of misogynistic culture at the school

Two students wrote a letter last year complaining of misogynistic culture at the school The school has reportedly suspended 10 students over the tram incident

The school has reportedly suspended 10 students over the tram incident St Kevin's has refused to answer questions sent by the ABC

As the private school prepares for its year 12 valedictory dinner on Tuesday night, it remains at the centre of controversy over an incident where dozens of students performed a sexist chant on a tram at the weekend.

Up to 10 students have been suspended by the school, according to a Herald Sun report.

Liberal MP Tim Wilson told the ABC he understood the students had been suspended.

"I think that's an entirely legitimate response from the school," he said.

Watch Duration: 42 seconds 42 s WARNING: OFFENSIVE CONTENT. St Kevin's students sing sexist song on tram

The ABC has also sent questions to the school about other allegations of sexist behaviour by its students. St Kevin's has refused to comment on or confirm the suspensions.

Luka Kiernan and another student, who did not want to be identified, said they wrote to the college's deputy head, Janet Canny, last June to raise concerns about "an ingrained misogynistic culture in much of its student base".

Mr Kiernan and the other student graduated from the school last year, and Mr Kiernan said he continued to work at St Kevin's as a tutor.

"There is wide-scale disrespect towards women, not at a superficial level, but more deeply," Mr Kiernan wrote to Ms Canny, in an email seen by the ABC.

"All students will maintain a level of respect and courtesy towards female teachers, and towards female students from other schools a majority of the time, but in many cases act maliciously at times when they aren't being watched."

'No genuine attempts' to change culture

Mr Kiernan said he approached the school after hearing fellow students brag about sexual conquests at parties, and believed what they were describing could have been assault. However, he did not pass on specific information because he was unable to verify the claims.

"It is hugely important that you realise that misunderstandings around consent are widespread, and throughout many St Kevin's students," he wrote.

Mr Kiernan and the other student said they met with Ms Canny for about an hour.

Afterwards, they said some students were shown a three-minute educational video about sexual consent, but no further action was taken.

The college's headmaster Stephen F. Russell said an investigation was underway. (Supplied)

"As far as I can tell, I know of no genuine attempts to change the culture," Mr Kiernan said.

On Tuesday the ABC sent a list of questions to St Kevin's College, none of which were answered by deadline.

"We will not be commenting on student matters," a spokeswoman said.

The school has previously stated that it has specific programs to "shape our boys' behaviour and attitudes about respectful relationships", but did not provide further details when sent questions by the ABC.

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'I will not let this matter lie': headmaster's warning

WARNING: Offensive content.

Earlier, the school's headmaster Stephen F Russell released a scathing letter to parents saying he was "upset, frustrated and angry" by year 10 and year 11 students who performed the sexist chant, while heading to an inter-school athletics event on Saturday.

The chant included the lines:

"I wish that all the ladies,

"Were holes in the road,

"And if I was a dump truck,

"I'd fill them with my load."

Mr Russell said the sexist behaviour "cannot go unchallenged" and issued a stern warning to students: "I will not let this matter lie".

Footage of the behaviour was recorded by a female passenger who was on the same tram as the students who were heading to an inter-school athletics carnival on Saturday.

The passenger said she felt disgusted and threatened by the behaviour.

Mr Kiernan said he was not surprised by the incident.

"It really just shows a level of confidence and audacity these boys have in their own sexist attitudes," he said.

"They feel that they can express them publicly on a tram without any shame at all."

Sexist chant performed at uni colleges

The same chant was regularly performed in the notorious Bay 13 section of the Melbourne Cricket Ground during cricket games, and the ABC has been contacted by several people who have heard it at university college gatherings.

In 2016, the president of the University of New South Wales (UNSW) Baxter College denounced his own involvement in performing the chant on a "Boys' Night Out".

"It has been ingrained in many college societies for too long that those things can be gotten away with," James Dunn said at the time.