The number is far from meaningless. It’s a PERCENTILE rank which means you don’t even need to know how many people took the test. It tells you what PERCENTAGE of students scored below you.
e.g. If you got a Rank of 36 then it would mean that 36% of all the other students scored below that.
Rank is between 1 and 99. 1 means you are the bottom student and 99 means you are the top student. A Rank of 50 is average. Below 50 is below average. Roughly the top 15% stand a good chance of passing so this would be a Rank of 85 or above.
Hope this makes sense