Practice, Teil by Teil
The first two exercises in every Teil are free and need no account — open one and go. Each module is passed on its own at 60 points, so you can put your time where it is short.
A module is not one skill, it is four or five separate tasks wearing the same cover. Lesen alone asks for very different things — matching statements to people, filling gaps in a text, judging comments, reading a set of rules — and it is entirely normal to be comfortable with some of those and lose points steadily on the rest. Sitting whole mock modules over and over tells you the total went up; practising Teil by Teil tells you which Teil moved.
That is what this section is for. There are 1005 practice exercises here, filed by module and by Teil, each one built to the official format and each one explained question by question. Work the Teile you are weakest at until the format stops surprising you, then sit a full timed module to check it holds together under the clock.
The first two exercises in every Teil and the first two tasks of each Schreiben Textsorte are free and open without an account, and so is one Modellprüfung per module, so you can find out what the material is like before deciding anything. What comes with a pass is Felix's marking of Schreiben and Sprechen — and an account with a confirmed email gets one free preview of it per module.
Not for the free exercises — they open straight away, with no email and no card. An account starts to matter when you want your attempts kept and your progress tracked, and creating one is free too.
The one you are furthest from 60 points in, because the modules are passed separately and there is no compensation between them. If you genuinely cannot tell, the free level test — about 25 minutes of Lesen and Hören in the real formats — gives you an honest band at the end.
Both, in that order. Teil practice fixes the specific task types you drop points on; a full module under the real clock tests something different — stamina, pacing, and whether you can still think clearly in the last ten minutes. Most candidates get the best of it by drilling Teile through their preparation and sitting complete modules in the final few weeks.