Reddit reviews 5 books Pakkuno-30S10-5X5 Kokuyo Campus Notes by Application B5 5mm grid ruled (japan import)
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KOKUYO notebook Campus notebook B5 5mm grid by application 5 books No-30S10-5X5
Also, if you need extra practice with writing, it helps to have the Campus Notebooks-the kind they use in Japan. https://www.amazon.com/books-Pakkuno-30S10-5X5-Kokuyo-Campus-Application/dp/B0012OTICE/ref=pd_sim_229_3?_encoding=UTF8&pd_rd_i=B0012OTICE&pd_rd_r=XYQTYE4Q2E2KDN44DKK2&pd_rd_w=Z7IIR&pd_rd_wg=wjRUe&psc=1&refRID=XYQTYE4Q2E2KDN44DKK2
The reason is that you should be able to write the characters in the squares -one character per square.
There is also a few workbooks, children level, on Amazon if you want to spend a few more bucks to use them for extra practice. https://www.amazon.com/Hiragana-Katakana-Workbook-Elementary-Workbooks/dp/B00WX1SB8C/ref=sr_1_11?ie=UTF8&qid=1501126710&sr=8-11&keywords=japanese+notebook