Certium

Certium is a drill-focused, AI-powered exam preparation platform for the Goethe-Zertifikat B1 and TELC Deutsch B1 German language exams. It covers all four sections with exam-style tasks and instant feedback.

Lesen (Reading): Exam-style reading comprehension with multiple choice, true/false, and matching questions matched to the official Goethe and TELC B1 format.

Hören (Listening): Audio dialogues and monologues with exam-accurate question types and a timed reading phase before each audio — exactly as in the real exam.

Schreiben (Writing): Write formal letters, informal emails, forum posts, and short messages. GPT-4o grades your submission on grammar, vocabulary, coherence, and task completion, and returns line-by-line corrections with explanations in your language.

Sprechen (Speaking): Record yourself speaking on an exam topic. Whisper transcribes your response, then GPT-4o evaluates fluency, grammar, vocabulary, and task completion — with specific corrections, not just a score.

Full Mock Exams: Timed full-length Goethe B1 and TELC B1 simulations with proctored conditions, per-section timers, and automatic scoring.

Progress Tracking: Dashboard with streaks, weekly practice grid, B1 readiness indicator, and a countdown to your registered exam date.

Pricing: 4 exercises free with no account required. After free sign-up: unlimited Lesen and Hören, 7 AI evaluations, and 1 full mock exam. Pro plan unlocks unlimited AI evaluations and mock exams.