Okay, now back to your audition repertoire. I cannot assess fully your level unless I heard your playing. However if your idea is playing a piece well is just playing them 'up-to-speed' , you still have a long way to go. As a general rule, you should spend 2 times the amount of time you learn the notes for a piece to work out the music, such as the dynamic change, tonal qualities and colours, voicing, and adding your own intepretation. It took me one whole month learn to prelude and fugue no 3 from WTC book 1 to play the notes and getting up to speed, but that was 2 months ago, up to today I still play them very very slowly and work out music.
But, anyway, I admire your enthusiasm and passion. And with proper guidance you may be able to achieve good standard. I will assess your repertoire and give you suggestions. And do check out my repertoire progression threads to get better idea of repertoire , advance level should be doable for you to bring for audition.
Okay, you have done prelude 1 ,2, and invention no 1. For an audition with prelude and fugue as one of the repertoire required, the fugue is what the judges want to hear. And to tell you the truth, fugues are very evil to learn and memorise, and not to mention playing it well. Take up one or two prelude and fugues before you decide on your final prelude and fugue , and don't choose those that are way too difficult, like no 3. However, take your time and learn a few more inventions and sinfonias along the way, they will help you understand bach's music better.
For your other repertoire, you played a Brahms Waltz, well, the pieces for your audition will be much larger in scale and attempting a romantic or contemporary sonatas will be tantamount to musical suicide. It seems like your technique is not that good yet, so it would be best for you to refrain from overly virtuosic pieces such as Liszt. You can try to play Chopin's nocturnes, Faure's barcarolles, or Schubert's impromptus. And focus on getting a good cantabile playing, it is very very important in playing romantic pieces.
For 20th century, tough choice, you have not tried any, so I would suggest you try out easier contemporary pieces by different composers so you know which kind of sound and style you would prefer. Contemporary pieces are tricky to play and many of them are quite difficult technically.
Do talk with your teacher about the audition repertoire. Let us know again what will be your final choice. Do the pieces that you will be comfortable technically and make the best music you can.