Last updated: 14 November 2026
Prep 4 Cert is an Android app with practice questions for certification exams, published by Kalmarium Services BV (the Netherlands). This policy explains what the app does with data.
There is no account. Your study data stays on your device. People who have not bought anything see a banner ad from Google AdMob, which collects some data as described under Ads. After any purchase the app shows no ads and sends no ad-related data. The app also downloads new exam content from our public website; these downloads send no personal data.
Your study data stays on your device: answers, mistake counters, saved questions, tags, test results, settings, and a record of which exams you unlocked. It is not sent to us. If Android backup is switched on for your Google account, Android may include this data in your device backup, under Google's terms. Uninstalling the app deletes the data from the device.
Until you buy something, the app shows a banner ad from Google AdMob at the bottom of the main screens (never during a test). To show and measure ads, Google and its partners may collect and process your advertising ID, IP address (which gives an approximate location), device information and ad interactions. In the European Economic Area, the United Kingdom and Switzerland the app asks for your consent before any ad is requested, and you can change your choice at any time under About, Ad privacy choices. More about how Google uses data: policies.google.com/technologies/partner-sites.
Any purchase (one exam, a bundle or lifetime access) removes all ads, and with them all ad-related data collection in the app.
New and updated exams are downloaded from gaborkalmar83.github.io (GitHub Pages). These are plain file downloads; GitHub may log your IP address as any web server does. The app sends no personal data with them.
Exams, exam bundles and lifetime access are bought through Google Play Billing. Google processes the payment and holds your payment details. The app only receives confirmation of which products were bought. We do not receive your name, email address or card details.
Answers link to official documentation, for example on learn.microsoft.com. These pages open in your browser and are covered by the privacy policies of their owners.
The app requests no dangerous permissions. It uses internet access (exam downloads and ads), the Google Play Billing permission (purchases) and the advertising ID permission (ads, only for people who have bought nothing).
The practice questions and explanations are drafted with AI assistance, checked against the vendor's official documentation and reviewed by the author, a Microsoft Certified Trainer. The app itself does not run an AI system on your device or send your input to one.
The app is intended for adults preparing for professional certifications and is not directed at children.
Prep 4 Cert is an independent study aid. It is not affiliated with, endorsed by or sponsored by Microsoft or The Open Group. The questions are original practice questions and are not taken from real exams.
If this policy changes, the new version is published on this page with a new date. Questions: kalmariumservices@gmail.com.