Difficulty of the PTs are designed to be roughly the same. Just take each test and hope the skills you learn from each carry over once you take the real one. Trying to find the easiest PTs is at best a time waster and at worst counterintuitive to progress.
Echoing what everyone else said here, yes do the Core Curriculum first, then do PTs (with Blind Review). The course is intentionally laid out like that on the Progress page: http://7sage.com/progress/
This was pretty much how you could characterize my progress. I guess our brains gradually and subtly synthesize everything together and a major boom in scores results. Definitely not a fluke and don't stop what you're doing!
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