I am curious as to where you got the "track" to start with
You don't require the actual track to answer the question. The ADF card is set to 000/360 and ADF readings taken relative to that.
Required knowledge for IREX exam.
Nobody in their right mind would be tracking on an NDB
If you are not rated on GPS or don't have a GPS in the aircraft what are you expected to do at a NDB only airfield? Let me guess - get a GPS! And when the GPS croaks what then......