Most colleges/military programs require an  entrance exam in order to gain admission.  For military enlistment, the ASVAB will be your required test.  For community colleges, the COMPASS, ACT or SAT is sufficient. For colleges and university, this requirement can be met by taking the ACT or the SAT.  For many schools, there are scores that you must receive in order to gain admission, be admitted into a certain program,  or earn scholarships.  The higher the score, the more opportunities you have.  For both tests, you will need to provide your high school CEEB code. 
Thomas Jefferson's CEEB code is  161-005
SAT: This test is comprised of 2 subtests:  Verbal, Math, and Writing.  The highest score you can receive is a 1600.  To register for the SAT test, go online to http://sat.collegeboard.org/register .
ACT:  This test is comprised of 4 possibly 5 subtests:  English, Math, Reading, and Science.  Writing is an optional subtest.  Check with your colleges and/or unversities to determine if you need to take the writing portion of the test.  The highest score you can receive is a 36 on the ACT.  To register for the ACT test, go online to: www.actstudent.org/start

                                                         ACT Test Dates 
 TEST DATE    SEPT. 8      OCT. 27     DEC. 8 FEB. 9     APR. 13 JUNE 8 JULY 13

 Sept. 28    Nov. 2 Jan. 11 Mar. 8 May 3 June 14
 LATE REGISTRATION  DEADLINE Aug. 26 Oct. 14 Nov. 19 Jan. 18 Mar. 25 May 20 June 24

SAT Test Dates

 OCT. 6     NOV. 3 DEC. 1 MAR. 9MAY 4  JUNE 1
 REGISTRATION DEADLINE July 27     Sept. 7 Oct. 5 Nov. 2 Feb. 8 Apr. 5 May 3    
 LATE REGISTRATION DEADLINE Aug. 15 Sept. 26 Oct. 24 Nov. 20 Feb. 27 Apri. 24 May 22