The Eszett course is 56 weeks across six levels. Every week has a goal you can say in one sentence, two or three grammar cards, a word field, a scene to play, something to read and listen to, a writing task and a check. The whole plan is here to read; the app is where a tutor teaches it to you.
The levels are those of the Common European Framework (CEFR). In Germany they are not abstract: A1 is the certificate for the spouse visa, B1 the one for the settlement permit, naturalisation and the end of the integration course, B2 what most employers and vocational training places ask for, C1 the door to university. The Goethe-Institut's guidance is about 200-350 lessons in total to reach A2, about 350-650 lessons in total for B1, about 600-800 lessons in total for B2 and about 800-1,000 lessons in total for C1 - with a tutor in your pocket and an hour a day, a level is a few months.
How a week works
Words of the week's field, with gender and plural, read aloud by the phone.
Grammar cards: the rule in your language and in German, examples, the typical mistakes - all 71 are here.
Drills on exactly those rules, checked against the dictionary, not guessed.
Ask the tutor the questions learners ask at this point - and your own.
Read and listen: a short text and a dialogue, then questions.
Speak: a scene with the tutor as the other person, then one of your own.
Write the kind of text the exams ask for, and get it corrected.
Check: a short test on the week; pass it and the next week opens.