Student or Learner
What's the difference between 'how is it going?' and 'how is it coming?'
The difference is mainly in the attitude of the speaker:
[to a child making a wooden ship] 'How's it going?' - the speaker is interested in progress, but probably doesn't mind if there hasn't been much/any
[to a student following a new course] 'How's it going?' - the speaker is interested how the person spoken to feels about progress
[to a subordinate] 'How's it coming? I need that report by lunchtime.' - the speaker is interested in progress towards a goal that directly affects him/her
Of course, in actual cases the amount (and balance) of interest may vary. A parent speaking to a toddler of limited artistic value may say 'How's it coming?' as a means of encouraging the child - making him/her think that the completion of the painting matters to the adult; and if it's nearly Someone's bedtime the parent might say 'How's it coming?' with a real interest in its completion.
That's the way I hear it. Other teachers may feel there's less of a difference than I detect.