If you plan to compete again, you have to ask yourself how you can prepare better. First of all three months is not a long time. You have to give yourself enough time to perform all the competition pieces, at least 5 times. That's a very modest number, by the way. A former teacher of mine met Glenn Gould backstage in his brief performing days, and complimented Mr Gould on his Beethoven Sonata op.109. Gould replied, according to my teacher, "I haven't quite learned it yet, I've only performed it 30 times."
You also have to practice your pieces on every kind of piano, and in every kind of acoustic. A friend of mine had to play a competition on a slanted stage. You never know what kind of bizarre arrangement, bad acoustic, or piano it is going to be. Part of the preparation is surprising yourself or challenging yourself with unflattering settings.
You can see that preparation for these things goes way beyond sitting at a piano and practicing. You have to perform, and constantly change your environment, in order to get the level of mastery you need to feel comfortable in the competition situation, which is high-stress, constant distraction, and exposed.
Walter Ramsey