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SAS Base Programming A00-231 exam is not a cupcake, and I can assure you this.
However, there are some things that will make sure that you sail through the preparations and the actual exam.
First of all, preparations will never be complete without giving mock tests or practice exams.
Here, I would advise not to go for any dump PDFs instead, try this actual online mock test. I found this site amazing as it not only covers the syllabus with Updated Certification, which is quite necessary if you do not want to get nervous during actual exams. All my friends have tried the site and have given positive reviews to me. I would advise aspirants like me to give a try to the Mock Test available at 
Thanks for reading