Ditto to what wehooker said send one to the middle or out side of the school and let it basically dead drift to the bottom and maybe give it a couple half hearted "dying" twitches or strips and hold on. I have caught some massive gar tearing through schools of shad that way. I may also suggest that you use a popper in an attractor or matching color if the school is close to the surface as this imitates a crippled shad and will elicit some of the most violent strikes you have ever seen.
Steve