As others have said, no one can really give you much of an assessment on whether you could get into a program with a dual degree. The repertoire you mention are some of the first ‘major’ concerto’s violin students work on, and typically at the level of school you are talking about kids are auditioning on pieces at the level of Mendelsohn and above, the most typical pieces I have seen are Sibelius, Tchaikovsky and those at a similar level (the Mendelsohn is not uncommon). The level is important, but more importantly is how well you are playing, the rule of thumb usually given that I believe has more than a bit of merit is to play the ‘lesser’ piece that you play well, rather than trying the more difficult one you are not as strong on.
Likewise, your competition wins may or may not indicate the level you are at in terms of your playing, unless a competition is one of the major competitions, that attract top level players (I am talking competitions like the Menuhin, Queen Elizabeth, the Montreal, Indianapolis and so forth), it is really hard to take much of out the many competitions out there, winning those just indicates that the jury thought the winner was playing better than the other competitors and doesn’t indicate levels for something like music school admissions.
I agree with what others have written, one of the best things you can do for yourself is if at all possible to get an assessment of your strengths and weaknesses, from either a high level teacher or even better, a teacher associated with a decent school of music. I assume you are in Canada, if you are near Montreal then a teacher at McGill would be a decent assessment, or if not find a relatively well regarded program closer to home and get an assessment there. Even though that is one teacher’s opinion, they likely can point out the high’s and lows of your playing.
If you read the threads on here about admission, you will hear from people that there is no science to it per se, no magical numbers, and that it is a very subjective thing, and that is true. Violin happens to be very, very competitive (my S is a violin student entering his senior year), extremely so, and the playing level to get into the competitive programs is very, very high. That said, teachers do look for kids who are uniquely musical, who have unique things about them, there have been plenty of kids who applied to top notch music schools into a top teacher’s studio, playing technically at an amazing level, who didn’t get in because musicality and other attributes were lacking in some way…so you don’t know entirely how they pick kids. It is why getting an assessment is important, because while school may vary on how they accept students, some of the programs you mention may be more willing to take a ‘diamond in the rough’ than others, but one thing I can tell you is that even programs looking for ‘diamonds in the rough’ will have a certain standard, so you need to know where you lie to see what options you have and that is where an assessment comes in.
Keep in mind there are multiple options available to you with music. You could go to school and get a degree in something like CS, while doing music at the school (many competitive universities have decent music programs for their students), take private lessons, and then perhaps get a master’s in music performance. Or you could instead of getting a BM, get a BA in music with another degree, then apply at grad school level…just saying that a BM/BA or BS double degree is not necessarily the only way to do this.