I have no clue when it comes to taxation as I have always just left it to the man to figure it out. Apologies if this is an exceedingly obvious question.

So I got to the Migros Klubschule to learn German, this relevant both to my job, and life here in general. Although it's only a small sum, about 800-900CHF per year, can I claim the entire cost back? or is it just a percentage thing.