FL3 is more representative of the current exam. Take it last. I would notrecommend taking it the day before the exam...take it 2-3 days before so you can effectively review it and be fully rested for test day.
I took FL 1 and FL 2 about one month before my exam and scored a 506 and 509, respectively. I took FL 3 a week before and scored a 515. I ended up with a 510 on the real deal. IMO, FL3 CP and PS are inflated and I thought CARS was just overall easier than the other FLs. I think FL2 was the most difficult and also the most predictive.
I took FL 1 and FL 2 about one month before my exam and scored a 506 and 509, respectively. I took FL 3 a week before and scored a 515. I ended up with a 510 on the real deal. IMO, FL3 CP and PS are inflated and I thought CARS was just overall easier than the other FLs. I think FL2 was the most difficult and also the most predictive.