just remember that tc is what you measure..it's the measured course that's all..nothing else has been taken into account.
true heading implies that the wind has been taken into account so that your 'heading' allows you to 'track' that tc.
magnetic heading implies that you have now taken 'magnetic variation' into account. as you know,you'll determine that variation along your course from the chart.
finally, course heading implies you've taken deviation in the 'compass' into account. factor that in and you have your final ch.
if your aircraft are like the ones i tend to have to use, the compasses haven't been 'swung' on a compass rose in so long that i don't even bother and stop at mh. i usually have to honestly set a dg in trainer aircraft to the mag heading of the runway..lol. fortunately, the examiners in our area have been understanding about this detail on ppl checkrides.
since it's a cfi ride, i'd recommend to focus more on what they all actually mean and you won't go wrong. keep in mind, you'll be teaching this material shortly during the second, or x-country phase of a student pilot's training. best to you.