Your scores are just under what we consider, and our feedback data supports, is a good place to be and that is scoring 80% or above.
If you would like, and have a Skype account, I can review some of the questions you got wrong and don't understand why your choice was incorrect. Alternatively and probably easier is to use the Live Feedback feature when reviewing your exam reports and leave us feedback for any questions where you aren't clear with why you got it wrong, or why you got something right that you completely guessed at.