These scores include your Armed Forces Qualification Test (AFQT) score as well as your scores on each of the 9 individual subtests that make up the ASVAB.  When you get your report, the most important score you will want to look for first is your AFQT score.  This score determines your eligibility to serve in the military and to enlist in the U.S. Marines you need to have achieved a score of at least 32.

The Armed Services Vocational Aptitude Battery (ASVAB) is a test that covers basic knowledge such as math and verbal skills, writing skills, and vocabulary. It is a required test for entrance into the military, but it can also be an indicator for general aptitude skills for other purposes. For those looking to go into military service, the ASVAB score is a crucial indicator of prospective job placement, so it is very important to take this test seriously and to focus on your strengths when taking the exam. Higher test scores often mean better jobs, higher salary, and more opportunities for advancement in the military.

Obviously, the most important way to prepare to take the test is to spend plenty of time reviewing practice test questions. Look at questions from all sections of the test, but pay special attention to questions on the Word Knowledge, Paragraph Comprehension, Arithmetic Reasoning, and Mathematics Knowledge sections, which will be used to calculate your Armed Forces Qualification Test (AFQT) score for enlistment.
One ASVAB sub-measure, the Armed Forces Qualification Test (AFQT)--which is just a separate analysis of the same tests that focuses only on four of the subtests--is also population-referenced, but its score from 1-99 is a percentile score. This means that if you score a 73, you scored as well as or higher than 73% of test-takers in the national sample.