The evaluation process will continue for 10-12 days, they added.
The BSE has made elaborate measures to ensure error-free and hassle free evaluation process.
The answer sheets will be checked at 58 evaluation centres, set up across the State.
More than 11,000 officials including 481 chief examiners, 900 deputy examiners, 8919 assistant examiners and 930 scrutinizers will be involved in the evaluation process.
The examiners have been asked to reach their respective evaluation centres by 10 am on May 20, officials added.
Nearly 6 lakh students had appeared for the annual BSE Odisha Matric Examinations, held in April this year.