Strange Correlation with reviewing

<p>My AP European test is in 6 days and I bought AP review by barrons and sparknotes. I took their tests and did pretty well with an average of about 67/80 but when I take online tests I usually do worse. I am very worried that the practice tests provided by Barron and Sparknotes are too easy. Is there anyway to conclusively say I’m prepared for the test with getting 67/80 on the practice tests? Or should I study more than I am studying now?</p>

<p>I just took a PR test and got +40 -34…</p>