29 ACT is like 1330-1350 SAT. So additional preparation for the SAT would not help for the first 100 points of score gain. However, any gain on the ACT would help.
The only reason to try to improve the (P)SAT would be if there was a realistic chance that the 11th grade PSAT could reach the National Merit threshold for large scholarships, but that would probably require a larger gain from 1250 than most would consider to be reasonably likely.