I found these that has a nice selection of old IB problems. Use these if you want to help study for the midterm!
http://nothingnerdy.wikispaces.com/IB+PHYSICS+REVISION
http://www.saburchill.com/physics/questions/quest.htm
http://nothingnerdy.wikispaces.com/IB+PHYSICS+REVISION
http://www.saburchill.com/physics/questions/quest.htm