ticket problem

i applied for viza, purpose internship and travel for 6 months and embassy ask me for work permit (now i read the new law from september 2013 and says internships are treated like work in china?) Is is hard to get for students? Also, now i want to apply for tourist viza for 3 months, but the flight tickets is booked for 6 months. I am on a bit of hurry to re-booked the return flight. Could that be a problem to have a 6 months ticket? and look for a viza for 3. And is it bank statment for 6 months pay needed to be shown as original document or scanned is ok also?