You must be aware that Red Hat exams are performance based where both the knowledge and practical skills of a candidate is tested.
KOALA - Kiosk on a Laptop exams are individual exams which are remotely monitored by Red Hat. For a candidate who is taking the KOALA exam, it is no different from taking a normal class-room based exam.
Only that the candidate takes the exam individually which is self-scheduled for his/her convenient time and location anywhere across the globe.