Before diving into the specifics of the N4 Kanji book, it is important to understand the pedigree of the Speed Master series. Published by ALC (a giant in Japanese language education), these books are designed with a specific philosophy: efficiency.
On your tablet, take a screenshot of a page from the PDF. Open it in a drawing app. Use a white brush to cover the kanji. Try to write the kanji from memory. Erase the white to check. speed master n4 kanji pdf