Review sections at the end of chapters with included answer keys.
Getting the is simple:
Anki is a free flashcard app. There are pre-made shared decks titled "Visual Kanji 1000" or "JLPT N5-N3 Picture Kanji." You can export these decks as a PDF using Anki's print plugin. This is 100% legal and free. Understanding Through Pictures 1000 Kanji Pdf Free