I just passed SAS Base & Adv exams recently. This SAS 认证-真题集系列 helped me surprising a lot, particularly for the advanced exam.
Here's my personal experience / suggestions:
(1) BASE exam
Easy.
Pass without any worry if you read through "SAS base Prep Guide" or SAS tutor; and did the official 50 practice questions (in this SAS 认证-真题集系列).
You are garanteed pass if you also finish the 123 practice questions for BASE exam (also in this SAS 认证-真题集系列)
(2) Adv exam
Hard but doable.
Must List: (1) SAS tutor; (2) Carefully study the suggested 130 practice questions (also in this SAS 认证-真题集系列).
SAS tutor doesn't have programming efficiency part, but please read some materials before the exam. After careful preparation, you may make 3-5 programming efficiency problems. I will upload all the materials I read for the efficiency part later.
After these, pass no worry.
Let me know your experience if you don't agree.