I just passed the PSM1 and PSPO1 examinations through self study. Is SPS also suitable for self study or is a course recommended?

Hi, 
I just passed the PSM1 and PSPO1 ( just scored 98% :-) ) examinations through self study.
But I am doubting about SPS. SPS is newer  there exist many alternatives to scaling scrum and there seems to be fewer resources.

Are people passing SPS through self study or is a course really needed?