Your comfortable range is the notes you can hold steadily. Exam questions are drawn from it.
Listen
Now sing the same note
Going up
Going down
I can't reach this note
Comfortable
23 semitones
Warm up with a little humming first; a cold voice measures narrower and strains sooner.
A suggestion, not a diagnosis. Voice type also depends on timbre and register transitions, which we don't measure. A teacher who hears you decides.