Izumi Massa (Study Japanese language and culture) 

You can study Japanese with Irodori Textbook by yourself with attached G-form (automatic scoring system). Now Romaji-Version is arriving. 
You can click the link of G-form and watch il video and answer the questions. 
You can see your score immediately and repeat anytime. 
いろどりText Book
独立行政法人国際交流基金日本語国際センター
The Japan Foundation Japanese-Language Institute, Urawa (https://www.irodori.jpf.go.jp/)

If you are teacher, you can use videos for students. The details: https://www.massaizumi.com/p/g.html