This document contains study notes for an AP World History Unit 1 exam comparing various civilizations, religions, and time periods across multiple categories. It includes comparisons between the Mauryans and Guptas in India, Mesopotamia and the Olmecs, Rome and the Han Dynasty in China, Athens and Rome, Buddhism and Christianity, Hinduism and Confucianism, classical India and China, river valley and classical civilizations, and Judaism and Christianity. Key similarities noted include social hierarchies, trade networks, writing systems, and religious beliefs. The document also defines important terms and reminds the student to consider reasons for differences in T-chart comparisons.