Seriously, do not double your practice time, you don't want to hurt yourself.
Play them just in the order you will at the concert, a little (but not much) under tempo, with full emotional involvement and make a habit of not stopping, even for the most egregious mistake. Do this again just a bit slower. (so, play as in the concert two times in a row, under tempo).
Then do something else at the piano, like sight-read or do your exercises. Then, once your mind doesn't think you are practicing performance anymore, isolate any problematic passages and do your regular clean-up work.
You will play them better than how you had them before, as you know them better.
Break a leg.