Depends. My son took it at 10th grade. even it was not

very good and that was it. Now he has 4 AP classes and he needs take SAT subject tests before he finish this school year(11th). I would say it is very busy for him. whatever he get will be it and there are no test dates during the summer. form AUG to end of March, he plays sport and from April to June it is the time for him to prepare for AP tests and those SAT tests. Summer is for work and volunteer.