Hello i have a question regarding DAS at the current age of 21

I'm just wondering, can I still do a "DAS"? It says on a few websites that DAS is only for a CBT-Full A license, but I'm assuming they do restricted versions of the DAS? I already have a CBT and passed the theory test. So, should I still get a Restricted DAS? Or what step should I take? Because I'm quite literally confused.