Psychometric tests are psychologically based methods of rating candidates on a variety of dimensions or scales. Psychometric test can measure aspects of the individual such as ability, personality, motivation, competencies, behaviors, and interests. Psychometric tests can include questions on math and comprehension.
If you want to improve your chances of getting the job you should understanding how tests work and practice it regularly. Regular practice will give you opportunity to work under conditions similar to those you will experience when taking the real test. Fortunately there are many books and sites that provide practice questions and detailed explanations to help you prepare for psychometric tests.