The CrunchPrep course is 100% online. It’s an all-inclusive course, and as such no additional books or PDFs or CDs are required. All full-length tests – which are a part of the course – are available online, so you will have the opportunity to experience the real GRE exam.
CrunchPrep is also a comprehensive solution to GRE prep course, so you don't have to purchase any separate learning or practice material. However, we recommend that you use ETS materials like the ETS Official Guides, and the free ETS PowerPrep tests to help understand the GRE exam better.