Does anyone know if a seventh grader can try-out for बास्केटबाल, बास्केटबॉल, बास्केट बॉल even if i dont know how to play?????

Well sure, आप COULD try out, but chances are आप wouldn't make it. The guys you'd be up against probably would have been playing for years. Of course, आप could always go out for intramural ball या something where you'd be guaranteed a spot.