A question about japanese highschools?

Question:

I know there are only 3 yrs in japanese highschool
but what do they call them??
do they call them like freshman, sophmore, junior, senior?? if so which one is not used since their only 3 yrs

Answer:

Yep they call them by years, which also in middle school and elementary school also by years
Yes high has 3 years

They would say "Kou Kou" + "(year)" + "sei"

高校一年生 (Kou Kou Ichi nen sei) 1st Year (10th grade)
高校二年生 (Kou Kou Ni nen sei) 2nd Year (11th grade)
高校三年生 (Kou Kou San nen sei) 3rd Year (12th grade)