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 the grammar explanations in them. 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)