To be honest i really don't think the exam marks between sittings are even comparable.
They are slung out of a computer and printed.
The difference between monthly sittings can be huge. When i did my instruments only 20% of the people where passing then 5 months later it was up to 70% (these numbers where given to me by my ground school).
So in one month you can be in the top 20% with a 75%.
And the next bottom 40% with the same mark.
And the chief pilots all know this as many of them had to sweat blood to get through the bloody things.
Which is why one or two companys might use them to get the number of applications down (but it will be HR not the ops side of things). But nobody really cares.
MJ