Are there official dMAT information videos, and what do they show?

Yes, official dMAT information videos exist, and you will find them at d-mat.de rather than inside the written preparatory materials. They are worth watching because they show you the digital test interface itself, which is a different kind of preparation from learning the content and rules through the PDF document.

Written Materials vs Information Videos

How to Use Both Resources Together

• Work through the written materials first to understand what each task type is asking of you and how the rules work.
• Watch the information videos once you already know the content, so you can focus purely on how the interface presents that content on screen.
• Watch the videos again in your final week of preparation, close to test day, so the click-through experience feels familiar rather than new.

Free dMAT Practice Tests

Every section of the exam, with full solution paths for each question. Work through one section at a time, then sit the full timed mock.

• dMAT Mock Test: full timed simulation, 80 questions, instant section scores
• Figure Sequences practice: 15 free Core Module questions
• Mathematical Equations practice: 15 free Core Module questions
• Latin Squares practice: 15 free Core Module puzzles
• General Academic Module practice: 15 free questions in the input format

My Advice

Do not skip the videos just because they are not the "real" study material. Walking into an unfamiliar digital interface under exam pressure wastes minutes you cannot get back, so give the videos fifteen focused minutes in your last week and remove that surprise entirely.