Assume it will be required. In my assessment of reported results here, kids who took the SSAT and submitted results did better in admissions. Even if they did not submit top scores they did better in admissions. Only one school we applied to did not accept scores and they substituted a weird homemade test that maxed out at prealgebra. Frankly, it was a good experience because it showed it wouldn’t fit.
If it isn’t required then you can make the choice.