Hello,
I have done a fully test exams on cakephp framework last 2 years ago (is older than yii), in admin area can be defined exams with questions and responses (with options: one - raio, more true - checkboxes, message response - textarea..etc).
So i like to do this job for you, I have readed the specs and the archive file, I can do the project, I will keep the communication to you daily with status of the project.
Also I have Yii experience, I have successefull used one year and I guess is the best framework at this moment, better than zend or codeigniter or older cakephp.
Kind regards,
Andrei