exam hell

We're a household in the middle of exam hell at the mo. The eldest is in the middle of her A levels. She is somewhat erratic with the revision and alternates between staring at her phone for hours on end and writing pages and pages of elaborate notes. 
Her bedroom is such a tip that she has now decamped to the dining table. It's completely covered in revision crap and we can no longer eat there.
She had a biology exam this morning so she stayed up all night to revise.
She is driving me mad.
Only 3 exams to go now though. In 11 days it will all be over.
Can't. Bloody. Wait.