<p>Why not just apply to the Royal College of Music in the first place? :D</p>
<p>I wouldn’t worry about any of those pieces being ‘too easy’. They’re fine if you can pull them off with convincing musicality. I personally wouldn’t consider Liszt to be ‘modern’ though.</p>
<p>If you are applying as an undergrad, then you should contact the piano faculty and ask them if there is any flexibility in the requirements. Sometimes they are strict, sometimes they post guidelines. . so ask away.</p>
<p>Also, do you have a private instructor? If so, has this person helped you pick your material? If not, you should be asking them as well.</p>
<p>Liszt is not 20th century (he died in 1886). Bach also wrote some “modern” sounding pieces, but that doesn’t mean you can count him for a 20th-21st century piece. They mean something like Bartok, though even that could be borderline for these purposes. Look at pieced composed in the 20th and 21st centuries.</p>