Long thread on the Kanken that gives a lot of different books/apps to use to study to take the exam which is all about reading and writing kanji.
I use the Kanken Step series https://amzn.to/2Atf99w, いちまると旅しよう！ しりもじ漢検 phone app https://play.google.com/store/apps/details?id=jp.or.kanken.shirikan.free, and the DS Game 漢検トレーニング.
I generally use the step books 1st and use graphing paper to learn the stroke order and sizing then move on to the app/DS game to solidify the knowledge. I don’t have a ‘write it this many times’ recommendation I just do it until I feel comfortable, the apps help here too (at least for me) if the app cant figure out what you’re trying to write, you’re probably still doing it wrong.