I use to have a ton of the problems everyone else seems to have, but I figured out what was wrong, and I suppose I should tell you how I fixed everything, and maybe help some people.
If you can't see the "Elementary/High school" venue option, make sure you delete ALL of the old venue mod before you download the new one, and if you want to be super safe, maybe re download the Get To School mod as well. I'm not sure if you have to do this, but I deleted any mods I had that had to do with school just encase.
The teacher podium only works if there is just one in the school; having multiple screws with the coding I guess. Took me a while to figure this one out.