The implication is not that people learned this skill from the SAT, but rather that not requiring it to score well on the SAT further lowers the baseline.
I encourage you not to be embarrassed and to simply opensource it. To err is human; anyone giving you grief because of bugs doesn't deserve the effort you've put in. And opening it now could actually bring assistance in getting those bugs fixed, while simultaneously benefitting everyone who wants to do something similar but isn't sure where to start