Review the subjects covered by the standardized test and spend an appropriate amount of time preparing for each section. Do not focus heavily on a math or English section that only constitutes a small percentage of the test. For example, the ACT includes two English-related sections (English and Reading) and only one math. Focusing instead on the area that will garner you the most points can be one key to getting the most possible questions right with your limited study time.
Study up on your vocabulary before you take the test. Many standardized tests place an emphasis on vocabulary, particularly once you get into graduate entrance exams, so expanding your vocabulary is always a way to improve your score. Flash cards can be purchased from many online retailers and local bookstores. You can always make the cards yourself, but purchasing the cards can be a quick way to expand your vocabulary.
Take sample standardized tests frequently. Sample tests are often available online for free and provide an authentic replica of the test. When taking sample tests, try to complete them in the same amount of time that is required on the standardized test you are taking. For example, the ACT allots 60 minutes for 60 questions in the math section. Take the timed portions of the exam under simulated testing conditions and practice completing all the questions within the allotted time.