Which Practice CATs worth retaking

Hi folks,

I've continued my studies from my first round where I've taken all PR practice cats, and gmatprep cats, and some MGMAT cats.

My first PR scores were:
PR1 - 640 34/45
MGMAT1 - 5
PR2- 570 30/39
PR3 - 650 37/43
GMATPrep1 - 680 42/44
PR4 - 600 31/42
GMATPrep2 - 630
GMATPrep1 - 620
GMATPrep2 - 600

Real GMAT - 630

So far I've taken
PowerPrep1 - 700 (feel this could be unfair becuase I've gone through most OG11 problems)
MGMAT2 - 610 (Q41/V33)
PR1 - 690 (Q42/V43)

With about 1.5 months left, I'd like to take practice tests that will give me an accurate picture of how I'm doing. MGMATs are good, but they do give me a lot of self doubt, however; these retakes and powerpreps leave me unsure if I should feel confident or not confident. Should I stick to MGMATs, retake the rest of the PRs, or pick up some new Kaplan ones (that I know are like MGMATs in that they are fairly difficult)?

I'd like to take the GMATPrep ones each at least once again, but dont' want to overdo it for the chance of repeats.

Any advice is appreciated.
J