Admission ticket (准考证). National ID card (身份证). Both, verified, in a transparent folder.
Two 2B pencils, sharpened. A pencil sharpener with a shavings-catcher. A soft eraser.
Two black-ink ballpoint pens. Not blue. Not gel unless allowed by your province.
A transparent ruler, a set of drawing compasses, and a set square for math and physics sessions.
A water bottle with the label removed. Some centers do not permit any labeled containers.
A tissue pack and a small hand towel. The rooms in June can be warm.
Nothing with electronics: no watch that vibrates, no smart bracelet, no wireless earbuds in your pocket. Not even switched off.
Pack the bag the night before and check it once in the morning. Do not repack in the morning — that is when you forget things.