Who would make them smarter? There are no schools or universities, and if there were something like that; it is controlled by Party.
Every single Prole is stupid, so some private conspired school is also impossible. Also, none of Proles realizes what is happening, so who would said them in the first place what is Party doing? Forget someone like William Wallace, Martin Luther, Oliver Cromwell, Robin Hood, Guiseppe Garibaldi etc; it's impossible!