Playing Mozart's sonata is very cruel. Although the score is not difficult, it is very demanding. Basically, if you make one mistake, you will be out of luck.

The third movement of Beethoven's Pathetique Sonata , the third movement of the Moonlight Sonata is fine. If you are more advanced, you can consider playing the Passionate 1 and 3 movements, Chopin's Scherzo No. 2, Ballade No. 1, or the Heroic Polonaise. ,,If you want etudes, it’s his black keys, revolution, no. 25 is fine,,

If you don’t have a good foundation, it’s best not to choose Liszt, you don’t need to think about it, Zhong, Kuang 2, Kuang 6, and Tarantella are all very good, but your level must be high ,,

If it doesn’t work, just choose some 8~10 level pieces from the grading book.,,

If you are desperate, just play Mozart’s sonatas. If your level is not high, I would rather choose If the difficulty level is lower, don’t choose some incompetent songs. The judges will know it as soon as they hear it.

I hope it will be useful to you.