Only way to really be ready for act reading is understanding the types of questions asked by taking practice tests or having good comprehension skills by spending more time reading, but it's a little late for either. But hey if your science is that high you have some pretty good comprehension skills, my best tip is focus on blazing through passages. Don't get hung up on a sentence or two because it will burn your time up. If it takes more than 30 seconds to think of the right answer to the question, skip it and come back to it after answering all the questions involved with the passage. Other than that, get some rest, wake up early and eat something light but nutritious, drink some coffee and get ready to ace the ACT