Although there is a vibrant Tibetan language publishing industry, there is still considerable pressure for Tibetans to learn and speak Chinese. Here are some pictures of banners hanging on the school gates of Lhasa.
The 3rd picture says spyid skad (meaning common language) in Tibetan. In Chinese it says putonghua which means Mandarin.
The last word, however, goes to a student from Tibet who has this on her blog: