Hi Henry,
Please contact your regional training coordinator for more information about lab purchase. Contact information is in the welcome message for the course.
We highly recommending reading the Study Guides, as well as doing the labs in order to best prepare for the certification exam. There is also an NSE 4 sample exam on the NSE Training Institute that you can take to access your knowledge and gauge your preparedness.
Hope that helps!
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Sarah Bailey
Manager, Training Release
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Sarah Bailey
Manager, Training Release