Basketball high school jv questions?

im 14 (i'll be 15 in a couple months) and next summer i want to tryout for the jv bball team at my school but idk wat postion(s) i should try out for and what my practice routines should be for the summer. I'm 6'1, 160lbs. and ive always been a center in elementary and middle school evn though i can shoot the 3-ball very accurately. I'm very good with my right hand but i cant go off the dribble as effectively with my left. so shuld i continue to work on my inside game as a center? or shuld i try to be more of a power forward type player?? thanks in advance 4 ur help.