Why read the readings ahead of time? Is this something you have ever wondered? If you read them ahead of time, you will be able to pay attention better during mass because you will know what is going on. Knowing where it is from will help you understand and put it in to context. You want to understand what the priest is saying when he discusses the readings in the homilies.
Search the Bible! (links to Blue Letter Bible, not a Catholic version. Use this tool to find a verse, then look it up in a reliable Catholic translation.)