How is Nail German different from apps like Duolingo or Babbel?

Duolingo and Babbel focus on general casual vocabulary matching. Nail German is an intensive examination drill engine built specifically for the grammar sections of official Goethe-Zertifikat and telc exams. It enforces strict CEFR rules, timed 15-minute mock simulations, and Leitner 3-streak active recall.

Which specific exams and CEFR levels are supported?

The curriculum spans all 6 CEFR levels (A1, A2, B1, B2, C1, C2) calibrated for Goethe-Zertifikat (A1–C2), telc Deutsch (A1–C1 Hochschule), and TestDaF.

Why is the Exam Simulator passing score set to exactly 60%?

Both Goethe-Institut and telc gGmbH officially require a minimum score of 60% (60/100 points or 9/15 items) to award an official language certificate. We match this exact Bestehensgrenze in our 15-minute exam simulator so you know your true test readiness.

Is the €19.99 Lifetime Pass truly a one-time payment with no subscription?

Yes. You pay €19.99 once and unlock permanent lifetime access to all 1,647 verified questions, all 6 CEFR levels (A1 to C2), unlimited exam simulations, and all future question updates with zero recurring charges or hidden fees.

Can I install this on my iPhone, Android, or laptop offline?

Yes! Nail German is built as a Progressive Web App (PWA). Open app.nailgerman.com on Safari or Chrome, tap Add to Home Screen, and the app installs as a full-screen standalone application that saves your local progress and works offline.

How does the 3-Box Ampel Leitner system work?

Every question is tracked individually in local storage. Missed questions drop to Box 1 (Rot) for immediate re-drilling. Questions advance to Box 2 (Gelb) upon 1 correct hit, and are only stamped Box 3 (Grün • Mastered) once you achieve 3 consecutive correct hits across mixed interval drills.

Should I use Nail German alone or alongside my current German course?

Nail German is engineered as the ultimate high-yield examination companion. While structured classroom courses (VHS, Goethe-Institut) and conversation apps provide listening and immersion, Nail German provides the high-frequency active recall drills needed to master examination grammar and clear the strict 60% Bestehensgrenze under timed pressure.

A2–B1 MasteryGoethe A2, Goethe B1, telc Deutsch B1

Two-Way Prepositions in German (Wechselpräpositionen)

The 9 two-way prepositions take Dative when describing a static location (Wo? / Where?), and Accusative when describing a movement or change of location (Wohin? / Where to?).

Mathematical Formula Blueprints

Static Location (Wo? + DATIV)

No change of location. The action happens in one place.

Subject+Static Verb (stehen / liegen / sein)+Preposition+DATIV ARTICLE (dem / der)

Example:

"Das Buch liegt auf dem Tisch (Dativ)."

Question: Wo liegt das Buch? -> auf dem Tisch (Dativ)

Directional Movement (Wohin? + AKKUSATIV)

Movement from point A across a boundary into point B.

Subject+Action Verb (legen / stellen / gehen)+Preposition+AKKUSATIV ARTICLE (den / die / das)

Example:

"Ich lege das Buch auf den Tisch (Akkusativ)."

Question: Wohin lege ich das Buch? -> auf den Tisch (Akkusativ)

Core Rules & Sentence Mechanics

The 9 Two-Way Prepositions (Die 9 Wechselpräpositionen)

The rule exclusively applies to these 9 words: an, auf, hinter, in, neben, über, unter, vor, zwischen.

in der Schule (Dativ, location) vs. in die Schule (Akkusativ, direction)

Positional Verb Pairs (Verben der Lage vs. Verben der Richtung)

German has paired verbs: Action verbs (stellen, legen, setzen, hängen) take Accusative. State verbs (stehen, liegen, sitzen, hängen) take Dative.

stellen + Akk (Ich stelle die Vase auf den Tisch) vs. stehen + Dat (Die Vase steht auf dem Tisch).

Reference Matrix & Master Table

The 9 Wechselpräpositionen Comparison Matrix
Preposition	Meaning	Wo? + Dativ (Static)	Wohin? + Akkusativ (Motion)
an	at / on (vertical)	Das Bild hängt an der Wand.	Ich hänge das Bild an die Wand.
auf	on (horizontal)	Die Tasse steht auf dem Tisch.	Ich stelle die Tasse auf den Tisch.
in	in / inside	Wir sind in der Küche.	Wir gehen in die Küche.
hinter	behind	Das Auto steht hinter dem Haus.	Er fährt das Auto hinter das Haus.
neben	next to	Er sitzt neben meiner Schwester.	Er setzt sich neben meine Schwester.
über	above / over	Die Lampe hängt über dem Tisch.	Er hängt die Lampe über den Tisch.
unter	under	Die Katze schläft unter dem Bett.	Die Katze läuft unter das Bett.
vor	in front of	Der Bus wartet vor der Station.	Der Bus fährt vor die Station.
zwischen	between	Das Heft liegt zwischen den Büchern.	Ich lege das Heft zwischen die Bücher.

Official Goethe & telc Exam Traps

Movement Inside a Closed Space (The Jogging Trap)

If movement occurs entirely INSIDE a single location (without crossing into a new area), the question is still "Wo?" and takes DATIVE.

COMMON MISTAKE (0 Points)

Ich jogge im Park (Dat) vs. Ich jogge in den Park (Akk).

CORRECT STRUCTURE

Ich jogge im Park = Running around inside the park (Dativ) | Ich jogge in den Park = Running from street into the park (Akkusativ).

Examiner Rule: Only movement across a border into a new destination triggers Akkusativ.

Live Interactive Calibration

KNOWLEDGE CHECK

Test Your Understanding

Try these 2 interactive calibration questions for Two-Way Prepositions in German (Wechselpräpositionen).

Question 1 of 2Wechselpräpositionen (Wohin)

Er stellt die Kaffeetasse vorsichtig auf [ ··· ] Tisch.

Question 2 of 2Wechselpräpositionen (Wo)

Die Schlüssel liegen seit heute Morgen in [ ··· ] Schublade.

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