<p>Many people here said that only CB material is acceptable for practice test.However,at the same time,there are also many ppl (include the CCer who posted ''Tips from a 2400er"{i think that's what it is})who say that using the other companies' (PR for example) practice tests is totally fine.</p>
<p>I would say that they are more useful than what the general consensus is here at CC. But still, I have my hands full with BB + Online course, so I think I’ll just be looking to outside sources for vocab lists and strategies, not sample problems.</p>
<p>I think others are a good idea for prep work, etc and even practice tests (some are more difficult than the actual test so they prepare you better) but they’re not a good idea for judging your score in most cases. (:</p>