The story of a skills trainer built from a real exam-prep experience
Start practicing nowPromsob started as a personal project. I'm a developer, and I wanted to help my girlfriend prepare for a job exam in Thailand. I looked around for practice material and found mostly static PDFs and collections of old questions — the same content no matter how many times you go through it.
The problem wasn't the number of questions — it was the lack of feedback. You can grind through hundreds of items and still not know where your weak spots are. Memorizing answers doesn't build real ability.
So I built Promsob: an adaptive skills trainer for math, English and logic. It tracks your performance at the level of 40+ atomic skills and drills the ones where you get things wrong most often. The mission is simple — make exam prep actually improve your skills, not just memorize answers. Free, right in your browser.
Math, English grammar and logic — 40+ atomic skills. The question set adapts to your level in real time.
See clearly which skills are strong and which are still weak, from your progress stats.
The trainer focuses on the skills you get wrong most often, instead of serving random questions.
Promsob is a general skills trainer, not an exam question bank — we don't hold past papers or replicate real exam patterns. Every question is built to train a specific skill.