This is rather embarrassing for me to admit, but it's the truth and I feel if I can pass my experience of this on to help someone further, then I'm going to do it.
Take everyone's advice here seriously. The FAA does questionable things a lot, but seriously, only memorize the answers and once you've passed the ADX written, dump most of it.
I've taken the ADX written three (yes, 3) times and have still not passed. Why? I went in thinking the same thing as you. Instead of just sitting there memorizing everything, I did the, "Well, this is going to be my job, I need to take all of this seriously and know everything and study everything thoroughly." And it's burned me. Sure, I still have a job in flight operations, but I'm not at the ultimate end game where I have a license in hand. There's not much forward momentum for me without that license. The people here giving you advise are giving it to you because they want to see you succeed. They've been down the path that you are going to attempt to go down. They are speaking from experience.