What doest it means in czech lenguage?

I agree with Sonia's translation, except for the last part. Stupen (which is related to stupnovat) mean a grade or a level or a gradation (like measuring lines on a measuring cup). Think of stupnovat, not as "graduate", but "leveling up", improving", or "getting better". So, the last part might be better stated as, "and I don't doubt that it will only get better."