For this exercises, you can use the following 2 rules:
1) Find convergence. For polar stereographic charts, convergence equals longitude. If in the northern hemisphere, invert direction (East becomes West, and vice versa)
2) Apply the rule. Convergence WEST, True BEST; Convergence EAST, True Least.
Regarding this question:
1) Grid convergence = angle between GN and TN;
on longitude 10ºE => convergence = 10ºW.
2) Convergence is west, therefore true is best:
- GRID = TRUE - convergence
GRID = 305º - 10º
GRID = 295º
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