your dumber than I even imagined should be you're dumber than I even imagined.
Perhaps the Class of 98 has been banned lately, but certainly not, as you put it, band.
And just for technicality's sake -- you misused singular subjects and collective pronouns (but I know how hard "their" is to get right).
Gee -- and YOU being the pro-education parent an' all!
If that is important to you. I understand your priorities.