The Level 1 Essentials course includes unlimited online access, printable worksheets, desk reference guides, and a grammar Q&A pdf.
The Level 2 Essentials PLUS course includes lifetime updates, select video content, and practice quiz questions. Plus, you get all the benefits of Level 1.
The Level 3 Platinum PLUS course includes lifetime updates, full-course videos, graded quizzes, and bonus chapters. Plus, you get all the benefits of Level 1 and Level 2.