Are the grades obtained from rowing—which are added to the academic total and affect university admission—considered rightful?

The question about playing in schools has three aspects:

1. Gaining admission to college based on grades obtained from sports is permissible, because it is through effort without cheating or bribery. 2. Schools making sports a core subject is not appropriate, because some students do not desire it, and a student might succeed based on it while failing in other subjects. 3. The nature of the sport must be known to determine whether it is permissible or not.