Start at the beginning and do as many as you can. Get a good sound on each note. Make sure transitions from one note to the next are smooth. Concentrate on moving the air through the horn to the very end. Breathe when you have to, but don't switch your embouchure. Note the alternate position markings, which are super handy when you start doing them faster.
You can also do these scales in minor keys, or other kinds of scales like half-diminished scales or altered scales. You can practice them slower and faster (for instance sometimes I do them as a brutal long tone routine, and sometimes I practice them double- or doodle-tonguing as fast as I can). And you can practice them soft or loud. I'll tell you from personal experience that playing the low scales soft and slowly doing each one a little louder until you're doing the high scales as loud as you can (assuming you can hit the notes!) is a really useful (and challenging) technique.
Let's all do this every day until July 15th, and report back with results.
Take note of how you do the first time, and on July 15th compare and see if you've made any improvement, and if so, how much. Post if you're having challenges. Chances are some of the rest of us are having those same challenges. Post if you've got a helpful hint. Post if it's just too friggin hard. LOL!
And when this one is over, let's find another fun one that we can all do together. Does this sound like fun? It does to me.
Whaddya think? Are you in? You have nothing to lose and high notes and scales to gain.