We have 5-mark system (from one to five)
We have vacations four time a year: Winter Vacation (10 days), Fall vacations (7 days), Spring (10 days), Summer (3 month)
We also have a small vacations for holidays (festivals): usually two or three days.
At place where I live (it called Siberia) we also have unformal vacations - we call it "the cancels". It means that we don't go to school, because it's too cold for studying. I'm in class 8th and we won't go to school if the temperature is lower than 35 degrees below zero. Unfortunately, this winter we don't have more cancels - it wasn't so much cold
Hope that help:)