If you take a look at the description of the course content
http://www.sun.com/training/catalog/courses/SL-275.xml#skscontent Note that 2 out of 10 of the listed objectives cover material that is not on the SCJP exam, i.e.
1) Create event-driven graphical user interface (GUI) using Java technology GUI components: panels, buttons, labels, text fields, and text areas
3) Create a simple Transmission Control Protocol/Internet Protocol (TCP/IP) networked client that communicates through sockets
Also note that the description of the course mentions nothing about specifically teaching you about the exam. I am sure it is a good course, but I suspect that it would be fairly incidental to being able to pass the SCJP course.
You would be better off spending your money on resources such as Kathy and Berts book and something from
www.whizlabs.com www.enthuware.com and my very own
http://www.examulator.com/tamer/course.htm