That's one of the dirty little secrets.
Our sons are pretty cynical about the whole college testing process by now. They've been subjected to an endless process of standardized testing, accompanied by a seemingly endless stream of requests from us for checks to pay for this test, that test, this prep book and that . . .
Both of them opted to forgo the SAT prep course offered by the school, which came at a significant savings over the privately offered ones. They decided that they could prepare well enough without it. We agreed that they could take the SAT test in the fall of Junior year, which gave them time enough to re-group if they did poorly without the prep class. It worked for our older son, and in the fall we'll see about his brother.
What our sons tell us is that many of the hyper competitive kids (mostly Asians) in their school take the SAT's 5 or 6 times until they get scores they can live with. They also take SAT subject tests one at a time, rather than take two on a single day. It has something to do with being able to drop the scores they don't like without dropping the results of the entire day of testing. I don't recall now whether it's a case of not turning in the test booklet or whether they choose not to report the day's results. It's all a bit over the top for me.
There's a huge industry sucking our bank accounts dry over this. Between local school taxes, universities, testing services, and the sundry coaching, advising and preparatory goods and services, it's quite a racket.