A Transport for NSW spokeswoman said the government was looking into instances of underage teens in the Illawarra applying for a false ID in order to be able to enter pubs during end of Year 12 celebrations.

As the investigations were ongoing, the spokeswoman declined to comment on which school or suburb the students came from.

Trying to acquire a false ID can result in a fine or even jail time.

This time of year always sees a spike in the number of underage people applying for fake ID like a driver's licence, according to Transport for NSW Executive Director Compliance and Regulatory Services Melinda Bailey.

She said the teens often use the details of older siblings or friends.

"This is a risky strategy as there is a very sophisticated face-matching system in place to help identify fraudulent applications," Mrs Bailey said.

"In under a minute up to 35 million images can be checked by the system to verify identity.

"Misrepresenting yourself when you apply for a licence or photo card has severe consequences, including significant fines and the chance of a jail sentence."

Transport for NSW data shows that, since March last year, 1220 cases of people with multiple records have been identified.

Of those 84 have already had their licence or photo card cancelled as it was obtained by lodging a false statement.