Extracurricular activities in high school?

My son is wondering if he should continue to do cross country. He is going into his junior year and he has done 2 years of track and a year prior of cross country. He was planning to make this the last, but with the PSAT, SAT, and 4 honor classes he wants to put more effort into his studies. I’m also worried because he scared that this wont be enough for his activities for college. He plans to do debate and another club which isn’t every single day. Will he be okay?