Because of using campus computer, can't type Chinese.

Just past advanced and based SAS programming tests and thinking of taking SAS clinical trial certification.

What's the differences between Clinical Trial certification and Clinical Trial Acceleration? Which one is harder or easier? Or which one is better than the other one?

I've the Exam practice test A00-280 (99 items), what's the difference in 280 and 281? what other useful books I can read to prepare the test?

feel free to refer me any resources!

xiexie!