The machine classification standard mentioned by @suimengwubu is different from that of people, which is not necessarily the reason why the machine classification system is not perfect. There is another reason: although your data is correct, the format behind the data is incorrect.

For example, EXCEL has such a problem:

This question is based on the date of birth to find the age (that is, to find the age of one year). You see, I am right now, but what a wonderful thing came out before I entered the calculation formula for the answer, and I couldn't get the correct answer anyway. Nani, what's the reason?

Yes, the format is date. How can it be an integer (one year old)? ?

The subject's question is: the format required in the question is text, but the format I use is numerical, and the age is 18. Why am I wrong?

In addition, the trunk of the question may not explicitly require that only text be scored, while text and values are not scored in the scoring system. And I got 18 directly after calculation, but I didn't know that the format symbols didn't match (the default format for software opening is numeric). Anyway, I got it right, so what?

The default values of the marking system and the software are perfect, so don't worry, this kind of question will not appear in the exam. When practicing at ordinary times, you only need to make clear the requirements of the questions to get points in the exam.

I wish you good grades in the exam in September. ?