Try Beijing Language and Culture University "BeiYu" they write the Hanyu Kaoshi (Chinese langue proficiency exam) and they have classes running at various times for short term and long term study.
Peking University and Tsinghua and People's University all offer classes but they will be on holiday at the time you wnat to study. All three of these universities offer Chinese language classes to foreigners in a seperate division of their school campus.
In the meantime check out
www.hello-han.com to get started with your Chinese.