I'm gonna have to advertise http://www.certforums.co.uk as an excelent resource for anyone who wants to learn about IT training and development.

I'll add some information about the exams below for interest

Exam Location: You can register for the exam at any Pearson VUE and Thompson Prometric center.
Time Allocated: 90 minutes per exam
Total marks: 900
Minimum Pass Marks: 220-601 (Essentials) - 675 marks; 220-602 - 700 marks ; 220-603 - 700 marks; 220-604 - 700 marks;
Number Of Questions: Approximatly 100 questions for Essentials. Other exams have 90 questions.
Exam format: Linear format; computer-based test (CBT)
Prerequisites: None
Validation Period: Certification does not expire
Score Report: Delivered immediate on test completion

Taken from http://www.proprofs.com/certification/comptia/a-plus/index.shtml