Are you sure you want to submit a music supplement? What school are you looking at? Those songs on the list are only around level 6 to level 8 that my D played during middle school years. So technically, they are not really challenging. However, one may still make an impressive performance out of them. But for music supplement at top schools, it better be impressive or one should not submit it.
So what level piece should I try to submit and what would some of those pieces be? If those are level 7 and 8, I think I could play a level 9 or 10 by the time I needed to submit them.
If it is for an extremely selective school like Stanford, submitting non-impressive music supplement would likely annoy the adcom and do more harm than help. Have you received any local/state/national level award? Just reaching the level 10 piano would not help your chance at all as they are a dime a dozen among the applicants for those schools.
As the other users above me said, these pieces are too easy for colleges to consider as part of your application. I know that the Mozart sonata is also known as Sonata facile and is considered as the most basic Mozart sonata, so if you are still interested in sending music supplements, I definitely would not include that piece. I, too, am a junior and was considering sending music supplements, but my counselor told me without awards and/or other forms of recognition, sending supplements would only hurt you.
@photogeek8 I wouldn’t say that one should avoid submitting a supplement without awards. The issue is that piano is by far the most popular music supplement with many applicants performing at the professional level.
Something you should know is that admissions officers rarely look at the supplement themselves. The supplement is sent off to the music faculty, which provides an evaluation.