depends on how fresh the material is to you. If you remember everything from bio, orgo and chem, maybe you can do well with 2 weeks of studying. 1 week is extremely unrealistic IMO especially if you have never done any of the PAT section. Math and reading, you can get away with little practice, but PAT you need alot of practice to do well. I don't even know why you would want to take the exam with only 1 week of studying. It's probably the most important exam in your life.