PT 67 was the hardest one I came across. The RC section is known to be particularly difficult and the LG section was substantially difficult (for me at least). I'm a mid/upper 160's guy and on PT67 I got a 158.
I've found that doing a couple of LR questions prior to doing a PT or doing a BR of an old test before a PT is extremely helpful. I just about won't take a PT without some sort of warm up.