While i did not go through the basic course, I do know a few who have. All the instructors have told us that an excellent study guide for the block tests are the end of lesson tests. Will the questions be identical? No, but they will be similar and usually the block tests are based off the sections covered in the end of lesson tests.
The enroute course used the EXACT questions from the end of lesson test. Specifically there was a question about the 3 minutes after two aircraft are estimated to pass tail to tail. Well, they used the exact same times and aircraft in the PV as they did in the end of lesson test.
I can't really speak for the basics course. I would think if you study the end of lesson tests you should be good. Oh yeah, and study the actual lesson too, not just the answers.
Basic Blocks and the Final do NOT come from end of lesson tests. They are a good study guide, but they are entirely new questions so you have to flip through the material as well. ITR and RTF Block Tests come verbatim from the end of lesson tests.