When you are taking the exam, you should look over the test first and just focus on the test and the test only. Don't worry about not finishing or how well or how poor your scores might be. That will help reduce some testing anxiety.
I totally agree. You have to tackle the exam one section at a time. You can't be thinking about your math portion when you are trying to hammer through the english portion. You have to devote all of your concentration in one thing at a time.