If you have some money to spare, I heard the Mosby's review book was the best. Also, try taking the PTCB practice exam to see what the exam is like so you get a better understanding of what to really focus on.
Most of the people here said they studied 2 weeks tops and passed. But I studied for 2 months and passed with extreme ease. Its really not that difficult but I went in over prepared so I don't think my opinion matters. Good luck