I can message you more exact details if you want, but my subGPA was above 3.9. I had around 300 hours volunteering with two populations, as well as research experience including conference presentations. I think having good grades definitely helps because it shows you are prepared to handle a pretty intense curriculum. Your references also matter, so it is good to pick them wisely. I think volunteering with two populations made a big difference for me too as a lot of people have amazing experience in the program. They like diversity so it is good to have unique experiences, as well.