There is no globally recognized university ranking system called "Must University Ranking." There are many university ranking organizations (like Times Higher Education, QS World University Rankings, ARWU/Shanghai Ranking, etc.), but none uses that name.
Perhaps you're thinking of a specific university with "Must" in its name, or a ranking specific to a particular region or criteria. If you can provide more information, I can try to help you find the ranking you're looking for.