I don't think that one week is enough and all my ex colleagues from Bristol would agree.
You have two options to pass the ATPL:
1. You understand the stuff
2. You just learn the questions.
stupid but will work.
Next is with BGS you get REAL paper in very good quallity and the best Instructors who i ever had
I don't know so much about cats therefore i can only say something about BGS.