If you have not taken or registered for the SAT, you must do so immediately. The SAT is a test required by four year college/universities as part of the admissions criteria. If you are planning on applying to a UC, CSU or private college/university, you must take the SAT.
The deadline for the November SAT is this Friday, September 26th. You can register online for the test at www.collegeboard.com. If you need a fee waiver see your counselor immediately.
You can also register for the ACT at www.act.org.