Diego’s Quintos ? What's this? Why such a funny name? What level is it? And most important, who on earth is the blogger? Any books published? This web log, or blog, was started by a teacher, me, Diego A. Nieto Marcó, for his students, but…. it became popular, receiving over 140,000 visits in just some years. Diego’s Quintos , which now should be Diego’s C’s , is the original name, because it was started back in January 2011 when quinto (fifth form) was the last course according to the official program and it was equivalent to the current advanced . When the European framework was implemented, advanced became a sixth course, level C1, and proficiency C2. After all those years as Diego’s Quintos it was a pity to change the name of the site for two very good reasons: the number of visitors and followers indicated the name had caught on, and, definitely most important, the name had become dear to the blogger and those who use it, among them his dear students; ev