Step 1: Census 2011 recorded India's overall literacy rate as about 74%. Step 2: Among the given states, Kerala recorded about 94%, which is the highest among all states. Step 3: Mizoram (about 91.6%), Goa (about 88.7%) and Tripura (about 87.2%) follow, but all are below Kerala. Step 4: Bihar had the lowest literacy rate (about 62–64%) among states. Answer: Kerala.