Regarding schooling...get all the answers on the tests correct.
Regarding books...there is an infinite supply of books available to you. Read them all.
Regarding learning as much as you can...see the answers above.
Okay, I've had my fun...
The thing that did it for me was to find a mentor (I've had several). It could be one of your instructors or another PT. Ask them every question you can think of. Ask them what you should be reading, what skills you need, how to do things, etc. Model them initially and then find your own way.
Oh, and don't forget to have a lot of fun and don't date one of your classmates. It doesn't work out.
Bill