Computer and mathematics belong to big science and can be evaluated at any time. This means that as long as the performance and papers are in place and the materials are ready, you can have a professional title after passing the review. The specific evaluation methods will vary from region to region and from unit to unit. In most areas, there are only evaluations, but no exams. As long as the performance and papers are in place, the materials are ready, and the evaluation is passed, you can have a professional title.