This is a matter of habit, and English and American writing is not very clear about how to say it. I can only say that according to my limited experience, all kinds of exams (college entrance examination, TOEFL, IELTS, GRE) are recommended to be standardized with a hundred points system; If it is a paper with a lot of data, you can use%.

Percentage refers to the percentage that one number is another number, also known as percentage or percentage. Percentages are usually not written in the form of fractions, but are represented by the symbol "%"(percent sign).

Percent is a special fraction, the denominator is 100 and the numerator is not an integer. Percent indicates that one number is a percentage of another number, indicating a ratio.