Variation / Deviation
From the Deviation card, track N, steer 003 (3 right) and at E steer 087 (3 left), so there is a difference of 6 degrees right to left. Interpolate and do the maths.
More importantly, for as much as you plan, when in the air, the wind will seldom be as planned, so corrections are necessary. So while good planning is very important, good technique for corrections is paramount.
Good luck with the exam and hope that helps.