Here's an alternative Independent certification and it's free if you already have Autocad skills
Step 1) Understand and be able to answer prep questions at www.inhousecadtraining.com.
(Free to practice Autocad compatible software is available, if you don't have access to Autocad software)
Step 2) These will prepare you to be able to easily pass an independent CAD skills assessment. Taken and marked over the internet.
Certificate wording:-
Has achieved independent certification of his/her CAD skills to a level
which was greater than the historic average achieved by current CAD users. The scope of his/her course covered many intermediate and advanced training topics.
We offer remote training at £45 per month on a no-contract basis
* Full manual posted to your home address
* 3hrs of remote 1 to 1 training to get you started
* Free to practice PC Windows based compatible software. (If you are a student you can have rental free Autocad software for 3 years)
* Work through the manual at your own pace with email support
* Take an included CAD skills assessment when you are ready
* Practice by copying PDF files taken from actual CAD work
* Offer current CAD skills to local employers
* Email support whilst you are working for an employer