

国家試験に合格するために、毎日勉強しています。
看護師になるには国家資格が必要です。
この島は小さいけれど、独立した国家です。
"こっか(国家)" is in the lesson "Geography" (Level 22), along with 9 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.