Not too late at all, a lot of people start getting experience around this time. You have plenty of holidays until October 2017, just make sure you use them wisely (especially summer), and get as much variety as possible; that's more important than sheer volume. I'd suggest trying to get placements at a couple of vet practices (large and small if possible), a couple of food producing farms, a kennel/cattery and a stable. Don't forget you can do weekly placements every weekend/after college to get your numbers up, if you need to. Between starting year 12 and applying, I did 22 weeks of placements at four vet practices, a kennel/cattery, lambing x2, an animal shelter, a lab, a zoo, a stable and I worked every Sunday on a farm, which would have been enough without the stuff I did in year 11 (indeed, some universities won't count experience that's too old), so it's definitely possible!
Best of luck!