The previous post lists the point scoring system used with the descriptors for the ESA50 & WCA. As stated in that post, you need 15 points to get ESA. If you score 15 points in only one section you will be placed in the ESA Support Group, as opposed to the Work Related Activity Group. The other way to be placed in to the Support Group is to meet one of the descriptors below.
If you are unfamiliar with the terms used above, please see this post.
Support group descriptors