The Debbies, with their song What Do I Know, managed to make the top five, beating out more than 1500 other entries.

Alex Robertson and Noah Egan, who had been friends since kindergarten, didn't intend to enter the Unearthed High competition when they first uploaded their songs but were stoked to be chosen as finalists.

"We just chucked them up and put them on Unearthed because everyone says to put in on Unearthed," Noah said.

"We forgot that Unearthed High was even coming back around and then it came back around and we already had three songs out... that was convenient.

"It kinda just worked out."

The boys found out they were Unearthed High finalists moments before they went into a Higher School Certificate trial exam.

"We were in the car, in the car park before the exams and were just chilling," Noah said.

"And we were like we'll listen in because there's another band here... these two girls here who play Kim's Laundry and we thought maybe they'd get into it as well.

"When they said 'St John the Evangelist, we have Debbies' and it came on with the song we were just going nuts - it was crazy.

"We found out literally 10 minutes before we went into the exam and had to go in and try not to smile."

"It just skyrocketed from there," Alex said.

Alex and Noah said their parents didn't quite realise the significance of their achievement at first.

"Mum doesn't get it and Dad just sits up before he goes to bed scanning Triple J... it's just embarrassing," Alex said.

"They didn't get how big it was - they do now."

Noah and Alex have now been trying to juggle their newfound success with their HSC trials.

"It's a lot to take in," Noah said.

"Especially with all the exams going on... you try to put your phone down to study but it just won't stop buzzing."

The boys described their sound as "coastal" and were influenced from where they both lived - Erowal Bay and Old Erowal Bay respectively.

"There's a lot of coastal punk up near Wollongong so that's where we got a lot of inspiration," Alex said.

"It's definitely jangly sort of stuff, stuff that's got a straight tone to it ... upbeat, kinda punky, a bit of pop-punk," Noah said.

Noah and Alex would hang out on the weekends and when they weren't surfing or skating started jamming with each other.

It grew from there and after a past band didn't work out, they settled on the name of Debbies.

"We used to be called Debbies Disco Biscuits but we didn't really do much with that band and we thought it was a bit of a rough name," Noah said.

"But we liked Debbies more.

"I swear everyone has an aunt called Debbie."

"Or your mum's friend," Alex said.

Although the boys were realistic about careers they had big plans for the next year.

"We're pretty keen to see where we can try and get off... we're going to try and get into a heap of festival slots next year which will be fun," Noah said.

"We want to pursue music but it just seems unrealistic. Whatever happens, happens.

"Definitely want an EP next year but we've got to start writing more."

The winner of the Unearthed High competition will be announced on Monday, with the winners being surprised by Triple J at their school.

If you'd like to listen to their music you can check out their Unearthed profile at https://www.triplejunearthed.com/artist/debbies.