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– Many libraries carry DELE preparation materials.

Buy a used physical copy on eBay or IberLibro for €10. Then, email Edinumen customer service with proof of purchase. Often, they will give you a code to download the audio and answer keys from their website.

Let's be honest. The publisher (Edinumen) does not offer a free official PDF of El Cronómetro C1 . Any website claiming to have the "full download" is likely a pirated copy.