Rather than selecting schools at the time of your SAT registration, with and give yourself time to evaluate your results; decide if you want to submit them; then send them, or not. I suggest reading, How To Get Into The Ivy League for a more detailed look at the importance of your SAT Scores.
The only downside is it costs you about $10 per school to forego sending at the time you register.
If you elect to send your scores when you register for the test, then it’s free. I believe you can send scores to two up to schools for free.
If you send the scores after the test I believe it costs $10 per test.