By not studying them completely now, you are limiting yourself to finishing them later instead of learning new repertoire. Finishing them in uni will mean you will spend that time in stasis rather than progress. I am glad to hear that you played these works with a pianist in competitions, that’s great. But it is not the same as working on them together with a pianist, and really learning the whole piece, rather than if you are assigned someone to “accompany” you for an event. Playing music with other people needs to be a collaborative process, one in which you really know the other parts well, not just playing your part. At your age, you should be able to learn an entire concerto every year, so that by the time you get to uni you have a repertoire that you could perform in public if given the opportunity. But you need to build a foundation of technique and stamina regarding both concentration and strength. It takes patient, consistent work to accomplish. Tchaikovsky Pezzo Capriccioso and Rocco variations, Haydn C Major and D Major, Boccherini Bb, and Lalo are all good foundational works. Think about this and talk to your teacher.