I suggest him to balance both volley ball and studies.Because in some cases you may be taken out of your team .At that time he can't do anything for livelihood if he only concentrates on volley ball.And India is trying to give importance for sports like volley ball,foot ball,basket ball.If he only concentrates on studies if he didn't get job he can't do anything.If he balance both if even he didn't get job he has chance to join in volleyball team.