日本語 Japanese Ask Questions Thread 4

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Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

Japanese Ask Questions Thread3
http://dis.4chan.org/read/lang/1267485093/1-40

Hi
I'm going to do the Nihongo nōryoku shiken (日本語能力試験) N4 and next year N3. I can learn the basic structures but what I needed was a loooot of exercises.
Could you recommend me some material or books which can help me? If it for download, better.
Thanks for advance.