The following are ideas of what behaviours you might see from a student experiencing issues with panic. If you are concerned you need to share your concern of the behaviour (and not a diagnosis!) with the school mental health team or the child's parents.
Academic Supports
Adjust deadlines, and student work output if necessary
Note:
Panic attacks are fairly common, and having one does not mean that the student has panic disorder. Panic attacks become a problem when the youth worries about having more attacks, or fears something bad will happen because of a panic attack. Also, panic attacks can occur in other anxiety disorders. For example, students with a phobia of dogs might have a panic attack when they are near a dog. In this case, however, the panic attack is expected, and the student is afraid of the dog, not the panic attack. In panic disorder, the panic attacks are unexpected or there is no clear reason for the panic attack to have occurred.
https://www.anxietybc.com/educators/panic-disorder-and-agoraphobia