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級， きゅう
1. (school) grade, year, class
2. class, grade, rank, level
3. kyu (junior rank in martial arts, go, shogi, etc.)
tbd
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在学， ざいがく
1. attending (school, college, etc.), being enrolled, being a student
在校学习(如上学、上大学等)、注册入学、身为学生
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd