Why does my child get anxious before every exam, no matter the subject?
Because for a genuinely anxious child, the trigger is not any particular subject or topic - it is the exam itself, as an event: the sense of being evaluated, timed and judged, with a result that feels permanent once the paper is submitted. That is why the same child can be visibly confident explaining a Maths concept out loud at home on Tuesday evening and still wake up Wednesday morning with a stomach ache before the Maths test on exactly that same material. The knowledge is not the problem. The evaluation is.
This matters because it changes where a parent should look for a fix. If the anxiety were about one specific subject, more revision in that subject would be the obvious answer. Since it usually is not subject-specific - the same pattern shows up before an English test, a Science test, even a spelling quiz - piling on more revision for whichever subject is next rarely touches the actual source of the distress, and can occasionally make it worse by adding more pressure to an already anxious evening.
The rest of this post works through what is physiologically happening in a genuinely anxious child, how to tell that apart from a child who is simply under-prepared and worried for a good reason, and a set of specific, practical routines - the night before, the morning of, and the weeks in between - that reliably help, alongside a few well-meaning things parents commonly try that quietly do not.