توضیحات:

How to use,
First, create a problem.
Go to "Make a card" on the first screen of the app, add a new ➡ enter a question ➡ register to make it.
Enter while switching between visible and hidden.
You can also select a subject from the menu.

If you have any problems, proceed from "Study with a card".
The sheet can be moved on the screen.

You can delete cards that you no longer need by going to "Organize Cards".

You can also add or delete courses from the menu on the first screen of the app.