The simple fact is that not everybody has the ability, or the possibility, or the desire to follow a full-scale High School program, and thereby receive a High School diploma. For this reason, an HSE test, or High School Equivalency test, could be just the solution to the issue.
Some well-known HSE tests include the General Educational Development (GED) and the California High School Proficiency Examination (CHSPE), but many High Schools are beginning to offer HSE tests and diplomas to foreign students, home-schoolers, special-needs students, drop-outs, etc. If you are contemplating going for anHSE test, your first necessary action should be to closely research your options. Find out what tests are available, which one will work best for you, and what its requirements and stipulations are. If you are planning to use your High School equivalent certificate to get into college, and you're thinking of taking a course other than the GED or CHSPE, make sure that the HSE test you're considering is backed by all the official and proper credentials, to avoid it getting turned down by some college review panel.
As with most other tests, a high score on your HSE test can make a big difference in your future studies and career; therefore it is advisable to invest whatever is necessary in terms of time and capital towards getting good test prep. Self-discipline and a good study program are essential, too, and cannot be disregarded if you're serious about getting a High School equivalency diploma.
If you've lacked formal schooling, and consequently feel nervous or worried that you won't pass your HSE test, the best advice we can offer you is to have courage, study all you can in preparation for the test, and then relax and do your best. And if you take the test and fail, you've gained something valuable, anyway: the knowledge of where your weaknesses lie. Knowing what your lacks are will help you sharpen your study skills and knowledge base, so that the next time around you'll be better prepared to pass the test with high scores.