I am currently going through the Series 7 material, it doesn't help you to do better trading. It just makes you to use tons of time to pass the test, get you the license to sell financial products and services. Series 7 license just helps you to be a legal salesman.
It's just like school, you tend to forget what your just learned because you don't get a chance to use it anyways in the real world. Even if your major is finance, you don't really learn anything in school that teach you how to trade. School and real world are always walk parellel untill you land a job before graduation. Then you will start to realize that school is just a place for meeting friends, boyfriends or girlfiends. School doesn't prepare you well to step into the real world. By then, you will study hard and get licenses, certification, and etc.