Ways to improve your TOEIC score

Do exactly the same test again. Once you have finished a whole practice test or one section of it, check your answers and check you understand why you made any mistakes you did. Write the vocabulary and grammar from the test you didn't know in your notebook, and test yourself on it at least 3 more times over the next week or two. You can then try the same test again to check your memory, make the language really stick in your mind, and boost your confidence.