I finally got to sitting around and listened to it a few times and here's my ranking (not including the 2 hidden tracks & intro)
Best to worst
1.Bang Bang
2.You Don't Know Me
3.Be My Baby (feat. Cashmere Cat)
4.One Last Time
5.Love Me Harder
6.Just A Little Bit of Your Heart
7.My Everything
8.Problem (feat. Iggy Azalea)
9.Hands On Me (feat. A$AP Ferg)
10.Break Your Heart Right Back (feat. Childish Gambino)
11.Why Try
12.Break Free (feat. Zedd)
13.Best Mistake (feat. Big Sean)
14.Only 1