I used the Drops app (https://play.google.com/store/apps/details?id=com.languagedrops.drops.international&hl=en&gl=US&pli=1) for a while, but it was mostly just vocabulary, and may not be entirely accurate :-/

I also watched some Toku Reo online https://www.tokureo.maori.nz/ There are hundreds of episodes with Grammar, Vocabulary, and Activities sections in each episode and online exercises to practice after each episode. There's also a short version of each episode.

I'm probably not the best person to give recommendations though, I've made very little progress...