I understand this is not strictly related to Chinese Language but may be helpful for people taking the HSK.
Here is what the test form looks like. The first part contains the personal info. The second part the answers to the test. Additionally, you will have a booklet with the questions (and that you will have to return). You will need to have a pencil to mark the right boxes.
The form will be read and evaluated by a machine. What is the most appropriate way to mark the boxes?