Imagine a year 12 double maths class with no teacher, where instead of learning, students are sitting on their phones during class. 

Or a school where almost a quarter of all teachers are away. 

That's the reality of what some schools are dealing with as teachers complain of a severe shortage. 

Today, Background Briefing's Mayeta Clarke, on her exclusive access inside a classroom and why we should worry about what’s to come.

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Mayeta Clark, reporter, ABC Background Briefing