Sai -memorization-

Sai is the app which displays the number you assign to
things you want to learn(English word, English sentence, chemical formula,
numerical formula etc),and help to　practice by repetition and promotes to fix the basic knowledge.
※Please use application in reference to the most right screenshot.

Even if there are few motivations, it is all right because once you get start, all you have to do is to match you with the progress of the app.
Specifically, look at ReadMe in the app.

Please try it willingly that is applicable to every your other content (probably) .
※Sorry,I may not cope with your request for inproving because this app was made by private person.