After the UPSC written examination, all the answer books are collected from the various examination centers and taken to the UPSC office in New Delhi. The evaluation of answer books is not done based on roll numbers or examination centers. At the UPSC office, the answer books are mixed and reshuffled before the evaluation. Later, a computer-based fictitious code number generated randomly is allotted to each answer book. Only after this process, the answer books are sent for evaluation to the examiners. The board has strict rules set for the evaluation of the UPSC answer books.