vice president me.

[themourningsky.livejournal.com]

i am running for eleventh grade vice president and their is a large russian-speaking population at my school and i would like to have a poster in russian. right now i have: голосуйте за Аллегру за одинадцатогь класса. спасибо! and i was wondering if that is correct. i didn't know how to say eleventh grade and i got two different answers from two different people: одинадцатогь класса and одинадцятий клас.

help would be greatly appreciated

-allegra