Cramming for two weeks isn’t an ideal strategy. If it’s possible, I would recommend using those two weeks as planned, then stretch out less concentrated study over the summer and take the SAT in late August. That would be before school starts, or at least before it gets busy, so time demands shouldn’t be an issue.
What many people are doing is prepping over the summer/fall and taking the PSAT/SAT around the same time, so October or November. This allows for a single target for prep and, with November, has the PSAT as a “practice” for the SAT a few weeks later.
It leaves plenty of time for another take in the Spring, even two if needed, plus August Senior year as an emergency.
There’s no rush to get it done early.