You need to change something. Pass this semester, then make a major change. If you're barely passing with the class average in the upper eighties, something is wrong. You need to get a tutor, talk to 2nd yrs, and even talk to more people in your class. You need to figure out a strategy that would work for you, and it may help to get ideas from others.
For all you know, there may be a master study list or document that lays out HY material being passed around your class. Even if it's not the case, there may just be things others are doing that could help.
There definitely is a difference between barely passing with a class average of say 78% than barely passing with a class average of 88%.
In the long run, passing is all that matters, but something is wrong with your current study strategy, and it needs to be addressed long before boards.