Well here's the low down Rapture: http://www.comptia.org/certification/Linux/general_info.asp
The exam tests seven domain areas:
Planning and Implementation (4%)
System Maintenance (14%)
Identify, Install and Maintain System Hardware (19%)
See the Linux+ exam objectives for more specific information about the CompTIA Linux+ exam content.
Taking the Exam
The CompTIA Linux+ exam consists of 94 questions and is scored on a scale of 100 - 900. The minimum passing score is 655. Ninety minutes are allowed to complete the exam.