While being asked for a heading is within the CASA Syllabus, the most common calculation is determining a Ground Speed, so focus on that with a tolerance of plus/minus 2 knots being acceptable.
The drift angle has been given in the answers only to assist students using a CR3 type circular computer with the Effective TAS correction. A negative drift angle represents Right Drift while a postive drift angle is Left Drift.
Slide Computers are much easier to use for this exam!