I have quite a bit of experience with this. To put it simply, it will make gyno worse. You will want to cut down estrogen conversion with the use of an AI. Also it would be prudent to use nolva while on cycle to keep gyno at bay. There are several AIs to choose from - some swear by this, others swear by that. Unfortunately you may experience some trial and error here. I prefer dex personally. If you have nolva on hand and you are using AI X, and you notice things start to get worse, you can ramp up the nolva to 80mg+ a day. That dosage may actually eliminate your gyno outright.
The problem with adolescent gyno is that no matter what you use to keep it at bay, or wipe it out, is really only a temp fix as it will most likely come back when you stop whatever you are using to eliminate it.
Oddly enough, I had gyno all the way up until my first cycle, and now I only have it when I'm off cycle heh.