Are you sitting by the pool with your feet up every day? Working a summer job to pay for penny candy and movie shows? (Yes, I know penny candy costs a dollar now.)
The summer is closer to being over than you think. Now would be a good time to start studying for the SAT or any other test you have coming up in the fall. You do not have to study all summer long, but get into the practice of doing one hour per day of intense studying and then, when the test comes around, you will be all the more ready for it.
Studying even a little bit adds up. It is like going to the gym or practicing for the big game. The more you do it, the greater your chance of success. Now is a great time to start. So what are you waiting for?