The 42 curriculum is famously peer-to-peer and lacks official "textbooks." Therefore, the student community uses GitHub to document the exam environment and requirements.
You can find the exact list of potential questions, ranging from simple string manipulations to complex algorithms. 42-exam github
Seeing how others solved inter , union , or ft_printf helps you understand the most efficient logic. Top Resources to Search For The 42 curriculum is famously peer-to-peer and lacks
Clone a reputable repository and try to solve the problems without looking at the solutions first. 42-exam github