Dreaming of exam unprepared is a warning sign as per dream interpretation and meaning. The dream means you will come under stress and tension soon. It also means regret of not doing things on time. Dreams of exam unprepared are also a sign that you will not be ready for an important interview or appointment which will come up suddenly in near future.
Dream of exam unprepared and you are seen walking hastily or crying means failure and you will realize that it was due to your fault.
Dreams of exam unprepared and you see other people accusing you means friends or family turning against you. It also means you will be exposed.
Dreaming of exam unprepared and it takes place in an unknown place means things you have prepared will be of no use in a test or interview.
Please note that usually dreams associated with exam unprepared happen just before an important test or interview. The dream is nothing but an extension of daytime activity. Such dreams have no meaning.