It is way harder to get straight A's throughout high school than it is to get a decent SAT score. But the cold truth is that some colleges will not even consider you until you hit their bottom line score.
For example, elite schools (ie MIT, Harvard, Stanford, etc) will not even look at you if your SAT score is not at least 2200 give or take a little. And even if your SAT score is 2200, they will not necessarily accept you.
But if you're thinking of a less exclusive school (ie UCLA, NYU, etc) you have a chance of getting into one of them with a 2000... but to be on the safe side shoot for 2100.
You're going into the ninth grade? There is still a lot of time. You have three years to prepare for the SAT - think about it. You have three years to prepare for one test, and it's only one test. In addition, you can take that test as many times as you want.