About Testero

Who builds this

I'm Stephen Witkowski. While working at a Google Cloud consulting partner, where certifications are part of the job, I needed to pass the Professional Machine Learning Engineer exam.

Practice tests are how I learn. I found one course with four practice exams and a book with a few more, and that was about it. The real problem was memory: after one pass I recognized every question, and a single detail in the scenario gave the answer away before I had reasoned it through. I passed, but I ran out of fresh practice long before exam day.

So I built a way to get new questions. When Google updated the exam guide, older practice material stopped matching it. Testero now builds every question from current Google Cloud documentation: AI helps write each scenario, and each one is checked against the source docs before it goes live, including why every option is right or wrong.

If a question looks wrong, report it. I fix it and note the change.

Independent study tool. Not affiliated with Google.