Sweat at School: good antipersperant?

I sweat a lot and weird thing is, i only usually sweat while at school! So i have been trying to wear sleeveless shirts but it gets tiring. I have tried a bunch of "clinical" strength deodorants and they don't really help... I have also used Degree and Secret and Dove and a bunch of their clinical strength brands but nothing works. So i was wondering what i should use? I was looking and the web said "Certain Dri" was good. I wasn't so sure though. So any help? And if Certain Dri works, is the stick or roll-on work better?