Training and study are necessary, as in the CPDA exam. You can't take the exam until you have finished your training. My friend is also very strict in exams here.

And now is the era of the rise of big data, and the profession of data analyst has been more and more favored by everyone. With the vigorous development of big data, data analysts are in short supply and professionals are highly scarce. Data analysts play an important role in business development, risk assessment and decision support.

Because of this, the examination quality of this certificate is much higher than other vocational certificate examinations.