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There are games which utilize a single phone that's passed around the group, such as Heads Up! https://play.google.com/store/apps/details?id=com.wb.headsup&hl=en
Maybe someone knows of some better ones, but I've played this one (or one of the numerous clones of it, I'm not sure), and it was pretty fun.
Headbandz is good - someone hold the phone and people give clues (verbal and other) about the thing, and the person has to guess what it is.
Just Dance Now is great if you have a Chromecast - hold your phone and follow the on-screen dancer.
That's all I've got for PG games - if you want drinking games I've got a few
I've put all the cards in to this app - [link] - and sometimes play it between games.
It's fun and a really good way of learning what the cards do as well.
Legal heads-up (dis: [link]) was a lot of fun, we would have the case name and we would give the legal principle for the case. So I'd say to make games out of studying so that it doesn't feel as heavy.
Heads Up! is fun a game to play while drinking, but not necessarily a drinking game. However, you could definitely add some house rules to the game modes to give them a more drinking feel. For example, you have to drink every time your teammate skips a question or the losers of the round have to chug.