We investigate how the computerized dynamic assessment system improves the learning achievements of vocational high school students studying accounting. Our experiment was conducted under the one-group pretest-posttest design of 34 junior students. The questionnaire results were analyzed to determine student-learning attitudes and reactions toward self-knowledge of accounting, dynamic assessment system design dynamic assessment system learning effects, and user satisfaction. The results show that the continuous assessments designed for the accounting course using error identification, feedback, and guidance greatly assist in building student-learning concepts. However, certain students are either unfamiliar with using computers or refuse guided instructions for learning, which leads to little performance improvement. Nearly 85.3% of the participants consider that this system is worth recommending.