Depends on how much work you have left to do and what other exams you have available.
The sample exams are good, but somewhat easier than the mock. If you've studied well, then I think they're good practice for the questions you may get in the CFA exam.
That is the errata for the CFA Mock not the Sample Exams. Glad to see they have it for the mock but I'm still upset there are errors on an electronic exam which could be fixed very easily.