I don't want to scare you by no means man, It's definitely doable to crush the canadian DAT. Having said that, I took the canadian DAT last november and Took the american DAT just recently on august 10th. IMO the canadian biology section was more detailed and more plant/fungi/ecology/dev bio focused than human phys focused. I felt I was decently prepared for it but I only scored 19 (I was averaging around 35/40 on the boot camp tests). At the time I only did the first 5 boot camp tests, did a bunch of princeton practices from a prep course I took and I also did all of DAT destroyer 2009. On the recent american DAT that I took, I did all of boot camp, focused on all the random **** in bio (i.e. diversity unit etc...) and did 95% of the questions from destroyer 2017 and I ended up scoring 26. Personally I found my bio version to be well balanced, and slightly easier than the canadian DAT. Take away is that there are no shortcuts, you have to know all units well, and given enough study time you can crush it no problem.
p.s. you know those plant life cycles like ferns and stuff that you'd be tempted to skip? don't skip them.
Cheers.