In general, I think kaplan's practice tests are harder, especially on RC, QR, and PHY. If you want to have a standard level of the practice test, try the one on opted.org. I took it the night before my tests, and the results came out were almost the same.
I took a Kaplan course and my instructor actually told me that they make the practice tests harder so that students will get scared and take their courses... it's all about the money!!
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