Your repertoire choices seem good and at a high enough level for where you’re aiming.
As you say quite violin inspired rather than being from the mandolin world.
However after a certain level the piece presented is less important than the way it is presented and the reasons for doing so.
I wouldn’t spend any time working up any more pieces, rather delve deeply into the detail of those you choose from your list.
This goes back to what your father says, your musical choices and ability to communicate your understanding of the piece will be crucial for any performance. Dig in to see which pieces cover a good spread of techniques, maybe even do a wee chart with tick boxes to see clearly which pieces show your skills in as many areas as possible in the very limited time you will have to play for the tutors.
Then work and rework those pieces to get past mastering the technique to being able to reveal the music as you interpret it.
Have reasons (make notes as you practice) ready so you can explain why you go one way rather than another.
Make sure you examine a few viable options for each passage, eliminating those you find unconvincing (noting why)
The tutors will be looking for a certain level of skill, but crucially they will be looking for a passion to explore and understand the instrument and the music you play. They are less likely to be genre-bound than a violin academy, so you could venture outside the normal repertoire into choro, jazz etc . However in an entrance piece you probably will want to show you know the instrument can play as a ‘high-art’ instrument too. For this Calace is often a good choice, as his whole passion seems to have been to take the mandolin back into the musical circles it was previously played in the baroque era., but in a modern musical aesthetic of his times.
I also think getting a bit of insight into where your prospective tutors music takes them is a good idea.
http://mandolinscotland.org/mandolin/tutor.html
http://mandolinscotland.org/tuition/profiles.html
All the best with your progress.
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