On the subject of courses for test prep, etc... this is one of the reasons why there is a strong economic demographic correlation to SAT scores.
These four charts show how the SAT favors rich, educated families - The Washington Post
My dad invested in test prep for us... When my sister was a Jr. in HS he purchased an SAT study guide. When she was done with the SAT, she passed the book onto my brother. And when he was done, he passed it to me... it was only 4 years out of date.
He didn't make us practice - but we all took the opportunity to run the practice questions just to get familiar with the format. But this was wayyyyyy back in the 70's so the test was quite different.
Now there are summer boot camps for SAT prep.