Although the other posters are right in terms of giving pre-Columbian societies a certain amount of your time, I would say at least know some of the basics - those are a lot of societies you’re glossing over, if you’re referring to all established societies before 1492; if just talking about the pre-Columbian American societies, I’d say they’re still important! Even though the test can be a grab-bag of topics, you’ll feel better if you at least have a minimal grasp of the basic social structure/customs of the Incas, Mayas, etc.