You can't use 0.38mm black pen for CET-4 and CET-6, but only 0.5mm black pen. The marking of objective questions (multiple-choice questions) of Level 4 is automatically graded by machine scanning. As long as the correct options are marked and the color is preferably black (that is, filling), the machine will scan and score. So if you fill in the correct answer with a black water-based pen, it is equally effective and scored.

Matters needing attention in CET-4

If you encounter difficulties in the exam, you might as well put them aside and see if other questions are simple. For example, if you encounter difficult words in reading, you can do some simple ones first. You can choose the order of doing the questions when reading. For example, do paragraph matching questions first, then see if you are sure to read carefully or choose words to fill in the blanks, and try to do simple questions correctly.

In listening, you should first read the stem and find out the key words in the sentence. Take notes next to what you hear, or you can exclude it while listening. When preparing for the exam, you must listen to the real questions and master the vocabulary of some scenes, so as to find out the scenes where the article takes place.

The above contents refer to Baidu Encyclopedia-CET-4.