Have you used this textbook? Let me know in the comments how you are studying for HSK 3!
If you are a student, check your university's library database. Many schools have digital access to this textbook for free.
If you have been learning Mandarin Chinese for a while, you have definitely heard of the classic series: "El Nuevo Libro de Chino Práctico" (often known internationally as New Practical Chinese Reader ).
The digital version is usually much cheaper than the physical copy. You can buy the e-book and read it immediately on your phone or tablet. Search for: New Practical Chinese Reader Vol. 3 (English and Chinese Edition) .
Buy the digital edition for $15–$20, or find a used copy. Your journey to intermediate Chinese is worth the small investment.