I am preparing for PMP exam, highly motivated by this website, success stories and discussions. I have takem 35 PDU classroom training in April. Planning to take the exam in mid August. I have finished two rounds of PMBOK 4, one round of Head First, still not getting the grip on the subject.

Any specific suggestion on preparation?  I have around 3 weeks, how to utilise this three weeks effectively?

I have started giving mock tests, scores are around 70-75%, which is not very good I feel,