It's not 100% clear exactly what you're looking for, but this may help:
https://moodle.org/mod/forum/discuss.php?d=231146
In that thread, I posted three ways to get some per-category results.
It's not 100% clear exactly what you're looking for, but this may help:
https://moodle.org/mod/forum/discuss.php?d=231146
In that thread, I posted three ways to get some per-category results.