does cbse paper checking for all papers start at same time or paper which were completed first are checked earlier ?

Ashish, there is a different team that evaluates the answer sheets. Now once the exams are over, they are sealed for evaluation. The team of teachers will all gather at a assigned Evaluation centre and evaluate the answer sheets. Answer sheets are allotted to evaluators. Like for example, each evaluator is allotted 10-15 answer sheets to evaluate. This number is just an example. So the evaluator will evaluate all the answer sheets and assign marks. And after evaluation, another team will recheck the answer sheets and assess the marks given. So it is nothing like who first completed the exams will  be evaluated first. The evaluation is done at the same time.