: Includes over 250 university entrance exam problems from various Spanish regions, all fully solved.
| Resource | What It Offers | Language | |----------|----------------|-----------| | | Video lessons + practice exercises | Español / English | | LibreTexts Chemistry | Complete open-access textbooks (downloadable as PDF) | English (some Spanish) | | Biblioteca Digital de la UNAM | Free chemistry books (legal, for students) | Español | | MIT OpenCourseWare | Lecture notes, exams, and problem sets | English | | ChemCollective | Virtual labs and scenario-based problems | English | : Includes over 250 university entrance exam problems
is a popular study guide written by Marta Vítores Barranco , the creator of the "Amigos de la Química" YouTube channel. Key Details About the Book : Includes over 250 university entrance exam problems