Please do yourself a favor and carefully read the questions and answer what they are asking. In just going through these examples, I know the math, but missed 2 because I was just working careless / quickly - which is a common test taking mistake.
Also, if you are allowed scratch paper - use it. Read the question and as necessary, put it in to a from you are more familiar with.
Is this test timed? If not, there are some questions you can actually work backwards by plugging in each of the answers to see what works. This might not be the most efficient strategy - but it can help.
Are you penalized for guessing? If you are not, then be sure to answer every question. If you have no idea, or 1/2 an idea then you are that much closer to getting it right than wrong. For example - if two are the choices are negative numbers, and two are positive numbers, and you know that the answer has to be negative - but can't figure anything else out - you have given yourself a 50 / 50 chance.
Is this test a book and scan-tron? or on a computer? If the test isn't timed, and if you can write on your test book - Answer all the questions in the book, then translate (very carefully) your answers to the answer sheet. This keeps your concentration on the questions, and then get the formality of the scan tron done later. (NOTE: do not employ this strategy in a timed test - because if you run out of time, you get no score).
Also, if the test is on paper - there is no reason that you need to do the questions in order - skip around, do what you know and every once in a while on a test, another question will give you clues to the answer of a different question. (That happened to me several times when I was taking tests last year)
Really and truly, get a good night sleep, leave for the test site with plenty of time if you are going to be in traffic, and eat a healthy breakfast. I contend that people can raise their scores on a test 5 to 10 percent or more based on good test taking skills.