This version of the books is no longer part of the official curriculum but it has other uses: As additional resources: They may be available in university libraries as supplementary references for students to strengthen reading and grammar skills. Strengthening and Training: They are sometimes used in private training centers or institutes that offer short general English courses for the intermediate level, due to the simplicity of their grammar explanations. Self-study: Many self-learners prefer them as an additional reference for home study because of the clarity of their exercises. Testing Centers: They may be used as a question bank or as a source for reading passages in preparation for some informal local placement tests. In short: they are now treated as a "support reference" (This information is for your benefit)