Your score doesn't really depend on how many questions you get right.
The only reason to focus on your percentage accuracy is when you're comparing different problem types to each other. For instance, if you're at 70% accuracy on CR but only 30% accuracy on SC on the same practice test, that's a sign that you should work more on SC.
There are certainly patterns in the problems you're missing, even though it looks like you're all over the place. Go back and review your practice tests in greater depth, taking notes. Identify a couple of specific things that you're consistently missing - either content points or strategy points. Then focus on those.