Are these pieces too difficult to learn in a year? Can anyone rate them?

This is something you can do easily yourself though it consumes much time. Perfection doesn't mean skill, it means nothing if you practice as hard as you can and you don't like your music. Practice can only take you so far in life. When everyone was still playing twinkle twinkle little star with there private lesson teacher on there first week I was mastering Prelude Suite 1 Bach by myself, anyways the point is you have to be determined and love your music all the way for it to be perfect. You should listen to each one individually and check the music scores, choose out which ones you want to practice and play first then go on to the next ones. For me i would sort them out hardest to easiest and the ones at i like the most, then rank them all. I would practice my favorites first then do a few of the easy ones to warm up, the hard ones, then finish up with the rest of the easier ones. Remember to review all the songs your learning for this competition. This is quite the list, it must be a long competition.