You don’t need newspaper AND yearbook to get into a journalism program. They are both quite time-consuming, and I suspect that heavy involvement in both might prevent you from getting a leadership position in either. Also – in your school, are you required to take the class in order to be involved in the activity (in my kids’ school, this is the case, but I realize it might not be everywhere)? If that’s true, then you’re limiting what other classes you could take or depriving yourself of an off period that might be helpful for staying on top of your other courses. So unless you are absolutely passionate about both, then pick one. If you’re an aspiring journalist, pick newspaper and go for leadership positions. You’ll do a lot more journalism on newspaper than on yearbook. Also – you might develop other interests. And you don’t need an undergrad journalism major to be a journalist.
Also, I certainly hope you don’t need to make all A+ grades to make your mother proud. High school will throw you some curve balls, and some of those might be in the form of Bs.